Muzzle clearance is the first thing you should check! 1. Don't call your mate up and tell him to call you when hes at the top of the drive, and when he does so start firing at him with an air rifle. People get hurt. 2. Don't see if you can make flammable things more flammable by adding other flammable things to them in your mates shed. They go 'WOOSH!' scare you and make you knock the above mentioned 'super flammable' stuff onto the floor, thus setting said shed on fire. 3. When washing your dads car with the pressure washer, don't think you're clever and clean the pressure washer with itself - Its electric. 4. When flying round blind corners on your raleigh nitro between a wall and parked cars, make sure you cover the brakes, as when people 'magically appear' infront of you round said blind corner, rolling across the bonnet of a mini after crashing into it isnt fun. Especially when the people you just avoided running over are the girl you fancies older brother and mates. edit: lmao at the golf ball thing, thats great! A cool thing i learnt as a kid was to wrap a pingpong ball in tin foil and heat it with a lighter - hey presto! super smoke bomb!