A car full of Irish nuns is sitting at a traffic light in downtown Dublin, when a bunch of rowdy drunks pull up alongside of them.

"Hey, show us yer tits, ya bloody penguins!" shouts one of the drunks.
Quite shocked, Mother Superior turns to Sister Mary Immaculata and says, "I don't think they know who we are; show them your cross."

Sister Mary Immaculata rolls down her window and shouts, "Piss off, ya fookin' little wankers, before I come over there and rip yer balls off!"

Sister Mary Immaculata then rolls up her window, looks back at Mother Superior, quite innocently, and asks, "Did that sound cross enough?