"Old Folks at the Movies" joke

An elderly couple sat through a porno movie twice.

They didn't get up to leave until the theater was ready to close for the night.

' You folks must've enjoyed the show,' the usher says.

' Disgusting,' says the old lady.

' It was revolting,' her husband adds.

' Then why did you sit through it twice?' the usher asks.

' We had to wait until you turned up the house lights,' the old lady replies.

' We couldn't find my panties, and his teeth were in them!'