1) Look at see through glass and when someone is on the other side shout "OH MY GOD, I'M HIDEOUS!"
2) Call someone to tell them you can't talk right now.
3) Point at someone and shout "You're one of them!" Run and pretend to trip. Crawl away slowly.
4) Buy a donut and complain that there's a hole in it.
5) Put Mayonnaise in a bowl, freeze it, and tell your friend it's ice cream.
6) Put up a "Lost Dog" poster with a picture of a cat on it.
7) Walk up to someone, hand them a potato, look them in the eyes and deadpan 'with great power, comes great responsibility.' Walk away.
8) In a public toilet, pass a note under the door next to you saying, "They're onto us. We need to go."
9) Bring a desk on an elevator. When people try to get on ask if they have an appointment.
10) When someone asks you if you know what time it is, say yes and walk away.
11) Call Pizza Hut and ask for the phone number to Domino's.
12) Order a pizza 5 minutes before New Years, and when it comes, yell, "I ORDERED THIS THING A YEAR AGO!
13) Dress up as a duck and throw bread at people and say,"HOW DO YOU LIKE IT?!! HUH?!!!!
14) Go to a pet shop, point at an employee, and shout "I WANT THAT ONE MOMMY!!!"
15) Go to an electronic store with a banana and say that you want to upgrade to an apple.
16) In an elevator with a lot of people say I bet you are wondering why I have gathered you here today.
17) When someone says, "grab a seat" literally grab a chair and walk out of the room.
18) Hide in a clothing rack in Walmart, and when somebody goes by yell "PICK ME! PICK ME!"
19) Bring a big chair into the elevator facing away from the door and when someone walks in, dramatically turn and say 'we've been expecting you.'
20) Walk up to a random person and say, "Wow! You've changed, I still have your picture from five years ago." And hold up a picture of potato.