Zero asks Stanley if he can teach Zero how to read because, Zero was homeless before he went to juvenile hall(Camp Green Lake) and Stanley says yes to Zero.
The boys tell Stanley to move up one in the line for water so now Zero is in the back, Stanley feels bad for Zero. But the boys don't feel bad they just talk to Stanley.
Zero picks up a pool table ball when he sees that Stanley is about to get beat up. The boys help Stanley get up off the floor and say "Come on Caveman!" Then Stanley realizes that the boys were calling him Caveman.