Paddy comes home early from work and hears strange noises coming from the bedroom. So he runs upstairs to find his wife naked on the bed, panting and sweating. "What's up?" he says. "I'm having a heart attack!" cries his missus.
In a blind panic, he rushes back downstairs to grab the phone, but just as he's dialling, his 4-year-old son grabs him and says "Daddy! Daddy! Uncle Mike's hiding in your wardrobe and he's got no clothes on!"
Paddy slams the phone down and storms upstairs, past his screaming wife, and rips open the wardrobe door. Sure enough, there's his brother, totally naked, trying to hide behind the clothes.
"You rotten b*stard," says Paddy, "My wife's having a heart attack, and you're running around naked, scaring the kids!"