Each player gets one shot glass ("cave") and one large glass ("mosque"), plus another glass or bottle to sip from ("glass or bottle").
Fill the shot glasses with beer and leave the large glasses empty. Players must place their two glasses in front of themselves, but may arrange them in any position. (Protect your mosque!)
Players take turns "bombing caves", that is, bouncing quarters into opponents' shot glasses. Players must take a sip every time a quarter misses.
When a "cave" (shot glass) is successfully "bombed", the "cave dweller" must drink the contents of his shot glass, while the player who landed the quarter must pour the contents of his own shot glass into the opponent's "mosque" (large glass). Shot glasses should then be refilled.
The player whose mosque is destroyed first (i.e. their large glass gets filled first) must drink the contents of all large glasses.
Any player who accidentally bombs a mosque, that is, lands a quarter in an opponent's large glass, has caused "collateral damage", and must drink the contents of that glass.
