Danny is jealous of how much time Joey and Jesse are spending together, and they remember the first time they met, and how Danny and Joey became friends in the first place; Danny got a bloody nose from a bully, and Joey kept making fun of the bully. The bully goes to get a teacher, but Danny defends Joey, saying the bully started it all.
Good episode. It had some good humor (gimme back my basketball!) and it was a nice story and revelation of how all three of them met. This is easily one of my favorite episodes, and so it easily gets an A+ as a grade from me