I usually try and avoid list jokes... But, here ya go.

Things To Do In An Elevator
1) When there's only one other person in the elvator, tap them on the shoulder and then pretend it wasn't you.

2) Push the buttons and pretend they give you a shock. Smile, and go back for more.

3) Ask if you can push the button for other people, but push the wrong ones.

4) Call the Psychic Hotline from your cell phone and ask if they know what floor your on.

5) Hold the doors open and say your saiting for a friend. After a while, let the doors close, and say, "Hi Greg. How's your day
been?"

6) Drop a pen and wait until someone goes to pick it up, then scream, "That's mine!"

7) Bring a camera and take pictures of everyone in the elevator.

8) Move your desk into the elevator and whenever anyone gets on, ask if they have an apointment.

9) Lay down the twister mat and ask people if they would like to play.

10) Leave a box in the corner, and when someone gets on, ask them if they can hear ticking.

11) Pretend you are a flight attendant and review emergency procedures and exits with the passengers.

12) Ask, "Did you feel that?"

13) Stand really close to someone, sniffing them occasionally.

14) When the doors close, announce to the others, "It's okay, don't panic, they open again!"

15) Swat at flies that don't exist.

16) Tell people that you can see their aura.

17) Call out, "Group Hig!"and then enforce it.

18) Grimace painfully while smacking your forehead and muttering, "Shut up, all of you, just shut up!"

19) Crack open your briefcase or purse, and while peering inside, ask, "Got enough air in there?"

20) Stand silently and motionless in the corner, facing the wall, without getting off.

21) Stare at another passenger for a while, then announce in horror, "Your one of THEM!" and back away slowly.

22) Wear a puppet on your hand and use it to talk to the other passengers.

23) Listen to the elevator walls with your stethoscope.

24) Make explosion noises when anyone presses a button.

25) Stare, grinning at another passenger for a while, then announce, "I have new socks on".

26) Draw a little square on the floor with chalk and announce to the other passnegers, "This is MY personal space!"

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Fun Things to do at a Fast Food Drive Thru
1) Stand close to the speaker and yell your order, using colorful expletives in ways which would embarrass the patrons inside.

2) Drive through backwards.

3) Belch your order.

4) After ordering, cover the speaker and mic with transparent tape. Watch as customers and order-takers are unable to hear each other and, thus, each raises his/her volume.

5) Barter. Offer a Whopper for a Big Mac.

6) Walk through.

7) Speak a foreign language (make one up if you have to). When the manager comes to the mic, speak English and inquire as to why the order taker had such difficulty understanding you.

8) Repeat everything the order-taker says.

9) Attempt to take the order-takers order ("Hi, may I take your order?") before they get a chance to take yours.

10) Order confusing items, i.e., "Hi, I'll have a large orange Coke and a small medium fries, please".

11) In a crowded drive-thru line, place a HUGE order, then slip out of line and watch the fun as the person behind you is handed 40 bags of food.

12) When you arrive at the window to pick up your food, hand them several bags of garbage & ask if they'll dispose of it for you. Make sure it smells.

13) Drive through with a carload of naked people.

14) Speak in such a garbled fashion that the order-taker will think there is a problem with the speaker and ask you to order at the window. When you arrive at the window, speak in the same garbled, incomprehensible fashion.

15) Drive through with someone on the hood to accept the food.

16) Bring along a Mr. Microphone. When the order-taker speaks, aim the mic at their speaker but do so while aiming the Mr. Microphone speaker at the mic to produce excruciating feedback of their own voice.

17) One word: Flatulence!

18) Have a friend hide in the trunk. When you approach the window to pickup your order, have him start yelling and banging his fists on the trunk.

19) If you are a male, have a female friend place the order by speaking VERY seductively and suggestively into the speaker. When she finishes, have her hide and pull up to accept your order. See how many of the order-takers fellow employees have been called over to the window to "check out the babe".

20) Change a flat tire in the drive-thru lane.

lol, I love 19 in the fast food one

ROFL they were all so good lollll I spit on the comp screen I was laughing so hard.

I have walked through a few drive throughs in my time.

Me and a mate invented the greatest elevator prank of all time (IMO):

Ingredients:
3-4 can(s) dog food
1x pair old boots
Dried ice or substitute
Can opener
Spoon

Method:
1. Enter elevator and stop it between floors. Ensure someone is waiting on a different floor with a video camera.
2. Place boots on floor in center of elevator
3. Place dried ice inside of boots
4. Open cans of dog food
5. Using spoon, splatter dog food all over elevator.
6. Exit elevator and send it off.
7. Have waiting friend film people's reactions

Result:
When people open the door, all they'll see is a pair of smoking boots with meat splattered all over the wall. For that extra effect, try using some pre-prepared charcoal and soot.

Does the desk in the elevator remind anyone else of Monty Python?

That is GENIUS. I have to do that.

It takes a lot of effort and some funky timing, but it's worth it. Just make sure when you leave the building you take the stairs

Here's an interesting variation:

...Stay in the elevator with the boots. Have dog-food splattered on you as well (make sure you're wearing something you don't mind throwing out if the DF doesn't wash out).

When the door opens and someone's standing there, whimper and scream.

"I DON'T KNOW WHAT HAPPENED, HE WAS JUST STANDING THERE!"

I am doing that, I have no choice. It's just too much fun.