Put a used condom on someone's drive way or window
Knock at Someone's house and ask to speak to them and when their mum or dad go to get them, run off
Send somebody a heatproof mat in the post
Make someone a compilation CD of Hanson, Cliff Richard, Spice Girls, Peter Andre, Tom Jones etc. when they think they are getting a rap CD
Put a cone on a person's doorstep, ring the bell and run
Pull a gun on a woman cycling past on the street
When riding a bike ride on the pavement past an old person and hear their complaints
Steal a melon from a grocery store, give it a face and stick on a fence outside of a supermarket for all to see
When a police car is coming past shout "Police!" and jump over a nearby wall
Pretend to have a fight with a friend when a car is passing you on the street
Find a local celebrety and ask them to autopgraph a leaf for you
Walk in a random driveway and climb up a ladder propped up against a wall and see if anybody does anything
Go into a newsagent wearing a bandana covering your face and a hood up, and ask to buy some sweets
Roll up some tea leaves like a joint and give it to somebody and tell them it is weed
See above but with real leaves
Ring a random number at 3 in the morning and tell them they've won the recipe to a top sceret meal, read off a list of random things from your kitchen
Ring up a radio station and get them to big up imaginary names
Ring somebody and tell them they're live on the radio on a random number competition, ask them questions and tell them they've won something if they get them right
Call at somebody's house and ask to speak to them whilst wearing a balaclava
Ring somebody using this http://www.funnyjunk.com/pages/arnold.htm