"Wow. Bob, looks like you guys had one hell of a party last night,"the postie comments.
Bob, in obvious pain, replies "Actually we had it Saturday night. This is the first I have felt like moving since 4:00 am Sunday morning. We had about fifteen couples from around the neighbourhood over for some weekend fun and it got a bit wild. Hell, we all got so drunk around midnight that we started playing WHO AM I."
The postman thinks a moment and says, "How do you play WHO AM I?"
"Well, all the guys go in the bedroom and we come out one at a time with a sheet covering us and only our 'privates' showing through a hole in the sheet. Then the women try to guess who it is.
"The postie laughs and says, "Damn, I'm sorry I missed that."
"Probably a good thing you did," Bob responds.
Spoiler: