The Devil walks into a crowded bar. Within seconds the bar emptied with people running out screaming all over the place, all except for one old boy leant over the bar.

The Devil wanders across to the old boy and says "Do you know how I am?"

The old man took another sip of his beer and answered "Yep"

The Devil stared at the old man and asked "Well aren't you afraid?"

The old boy looks the Devil up and down for a minute and shrugs "nah, I've been married to your sister for 40 years. Why the hell should I be scared of you?"