When three or more willing homosexuals are having simultaneous anal intercourse(like so - >>>). The furthermost partys testicles swing away gaining momentum, swings back and hits the middle partys testicles, but due to the fact that the middle partys testicles are still in contact with the foremost partys testicles, it does not move but releases the energy into the foremost parties testicles swinging them forward, thus giving the "newtons cradle" effect.
Keith: Hey, have you seen that video online? its got the record for the most downloads in a single hour.
George: Nah what is it?
Keith: Its a video of Ricky Martin, Clay Aiken, Tom Cruise and Vin Diesel Newton Balling
George:WHAT THE F$#K!!