Heart Attack

A man gets home early from work and hears strange noises coming from the bedroom. 
He rushes upstairs to find his wife naked on the bed, sweating and panting. 
"What's up?" he says. 
"I'm having a heart attack," cries the woman. 
He rushes downstairs to grab the phone for ambulance, but just as he's dialing, his 4-year-old son comes up and says, "Daddy! Daddy! Uncle Fred is hiding in your closet and he's got no clothes on!" 
The man slams the phone down and storms upstairs into the bedroom, past his screaming wife, and rips open the wardrobe door. Sure enough, there is his brother, totally naked, covering on the closet floor. 
"You b*stard," the man says," my wife is having a heart attack and you're running around naked scaring the kids!"