Blink wildly and then close your eyes really tight for an interesting light show
(Amusement Potential: 1-5 minutes)
See a variety of blobs, stars and flashes. Try to make out shapes and see if your subconscious is trying to send you a message (perhaps that funny shape is saying, 'send all your money to
Try to not think about penguins
(Amusement Potential: 1-5 minutes)
This is especially hard, because by trying too much, you remember what you were trying to avoid thinking of. If you try too little, you end up thinking about penguins anyway.
Invent a weird twitch
(Amusement Potential: 5-10 minutes)
Adopt a bizarre twitch (e.g. flicking your head irregularly, twitching with eye or busting out sporadic cough noises) and try it out whe you go shopping.
Make a low buzzing noise
(Amusement Potential: 15-30 minutes)
Hours of fun in libraries! Keeping a totally straight face and looking nonchalant, make a low pitch humming/buzzing noise and see who reacts.