This is a joke I heard years ago in a french movie I was watching which actually translates pretty much perfectly. I don't think it's commonly known? At least I hope everyone hasn't heard it already. It's pretty dark, so, fair warning.
There's a local goon drinking in a bar one night, and as he drinks he gets more aggressive. He's been going all night and he's pretty loaded by this point, and when they finally throw him out of the bar he's in an angry mood.
Stumbling out the door and down the street, he spies a nun in her full habit. He steadies himself for a moment and steps up to her, staring her right in the eye for a moment. Then he hauls off and punches her in the face. She goes down, of course, and he stands there over her yelling at her to get up and get back in the fight until she climbs back to her feet, and he knocks her down again. Finally she crawls off as he stands there, swaying and leering.
"Not so tough after all, eh, Batman?"