Two Dublin nuns sat at traffic lights in their car when a bunch of rowdy drunks pulls up alongside.

"Oi, get your tits out, you penguins!" shouts one of the drunks.

The Mother Superior turns to Sister Immaculata,

"I don't think they know who we are - show them your cross".

So Sister Immaculata winds down her window and shouts,
"Screw off you little wankers, before I come over there and rip your balls off"!

Sister Immaculata looks back at the Mother Superior and asks?  "Was that cross enough?"