Pennywise and the losers club was fighting. The kids were winning and beating his ass inside and out.

Beverly: Punches him

Bill: Kicks him

Richie: Stabs him

Stanely: Kicks him in the nuts

Ben: Beats him with a crowbar

Max: Shoots him

Eddie: Punches him in the jaw

Pennywise: "GOD DAMMIT!!! WHAT MORE DO YOU KIDS WANT FROM ME?!?!"