Repeat the following conversation a dozen times: "Do you hear that?" "What?" "Never mind, it's gone now."
Decline to be seated at a restaurant, and simply eat their complementary mints by the cash register.
ONLY TYPE IN UPPERCASE
Repeat everything someone says, as a question.
When Christmas carolling, sing "Jingle Bells, Batman smells..." until physically restrained
Finish the 99 bottles of beer song
Inform others that they exist only in your imagination
Accuse people of "glue sniffing addictions" in public.
Reply to everything someone says with, "That's what you think
Forget the punchline to a long joke, but assure the listener it was a "real hoot".
Routinely handcuff yourself to furniture, informing the curious that you don't want to fall off "in case the big one comes
Make beeping noises when a large person backs up.
Repeat someone’s name repeatedly while saying “ Hey!”
Mow your lawn with scissors
Ask your co-workers mysterious questions, and scribble their answers in a notebook. Mutter something about "psychological profiles
Incessantly recite annoying phrases, such as "sticky wicket isn't cricket."
Select the same song on the jukebox fifty times
Scuff your feet on a dry, shaggy carpet and seek out victims.
Never make eye contact.
Shout random numbers while someone is counting.
When people ask you to do things, mutter under your breath, "This won't be neccessary where you are going."
Tell small children that they don't look very promising.
Teach cusses to small children.