Pearson, like any cool teenager out there, decided he wasn't going to let anyone drive past him without letting them know who they were dealing with. Armed with milkshakes and rocks, the essentials to any teenage-driven vehicle, Pearson and his fellow riders launched their arsenal at the unsuspecting car driving past, showering the two people inside with milkshake-covered rocks.
Both the passenger and the driver were hit, but refused medical attention. The cookie dough in the milkshake must have softened the blow.
Pearson was found and arrested for "assault, vehicular vandalism and criminal damaging." Pearson may have an alibi for throwing the milkshake, it might have tasted awful. But the rocks? He's screwed.