make sure you have the funniest clothes on (i chose the yellow jumpsuit)
get into a car (has to be rather fast)
drive around as fast as you can and look for a target.
a "target" can be defined as a group od random peds or an oncomming car or bike
hit triangle like twice fast when you have your target in the runway.
watch the carnage
For added fun: make a time bomb by having the car on fire right before you launch. this will either explode on contact if timed right, or explode a little after the hit.
another thing that is quite funny is to go for motorcycles..... the suckers dont know whats comming.
if you can get a bigrig/firetruck/ambulance to go fast enough it can be fun too