Jam miniature marshmallows up your nose and sneeze them out. See how many you can do at a time.
Use your MasterCard to pay your Visa and vice-versa.
Pop some popcorn without putting the lid on.
When someone says "have a nice day", tell them you have other plans.
Make a list of things to do that you have already done.
Fill out your tax form using Roman Numerals.
Leaf through "National Geographic" and draw underwear on the natives.
Tattoo "Out to Lunch" on your forehead.
Go shopping. Buy everything. Sweat in it. Return it the next day.
Pay your electric bill in pennies.
Drive to work in reverse.
Find out what a frog in a blender really looks like.
Tell you boss to "blow it out your mule" and let him figure it out.
Polish your car with earwax.
Read the dictionary upside down and look for secret messages.
Start a nasty rumor and see if you recognize it when it comes back to you.
Braid the hairs in each nostril.
Write a short story using alphabet soup.
Stare at people through the tines of a fork and pretend they're in jail.
Make up a language and ask people for directions in it.