My sweet and mellow Son #2 is an instigator.
Son #1 is a loud, hyper comedian with a penchant for mischief. He loves to make Son #2 laugh and will do just about anything to get a chuckle.
The other day, I was holding Son #2 when Son #1 began to run around like a cricket and make silly noises. Son #2 turned toward the racket and grinned. Son #1 saw the grin and amped up the silliness. Son #2 giggled and then let out a screech. That screech inspired my eldest son to more ridiculousness. It began to turn into an endless cycle of screeching and ever increasing silliness.
Though I was amused, I eventually had to have them stop. I assume had they gone on, protons might have split from their ever increasing energy.