Little Johnny walked into his dad's bedroom one day only to

Little Johnny walked into his dad's bedroom one day only to
catch him sitting on the side of his bed sliding a condom
onto his penis in preparation of sex with his wife.

Johnny's father in attempt to hide his full erection with a
condom on it bent over as if to look under the bed. Little
Johnny asked curiously 'What ya doin dad?'

His father quickly replied, 'I thought I saw a rat go
underneath the bed.'

To which Little Johnny replied 'What ya gonna do, screw
him?'