"Punch bar patron so hard he EXPLODES" is a mission objective in the quest "A Role-Playing Game" in Tiny Tina's Assault on Dragon Keep DLC
Walkthrough[edit]
Torgue the Gatekeeper's wants you to punch the Douchey Bar Patron so that he EXPLODES.
The Bar Patron has fled Moxxi Grog and Girls at this stage. Give chase, and punch him till he EXPLODES
