Clown Effect
When you and a good number of your comrades, preferably more than the number of car seats, pile into a car of any size to deliver street justice. When you approach the unsuspecting individual everyone files out of the car similar to the clowns exiting the tiny cars at the circus. You then proceed to deliver a beat down to the poor sap.
Man, that guy is such a douche I can't wait to Clown Effect him.
Clown Car Effect
The effect one gets when there are 15 or more people in a single elevator, effectively causing it to look like there are a bunch of clowns in the elevator.
Person 1: Dude, we all look so stupid in this elevator
Person 2: Yeah, that's the clown car effect for ya.
Person 2: Yeah, that's the clown car effect for ya.