THE DUKES OF HAZZARD star Johnny Knoxville isn't the only prankster in his family - his father once tricked his pals into believing they had contracted venereal diseases.

Knoxville, who famously displayed his love of zany antics on US TV show Jackass, admits his father has a joker history of his own.

He tells Maxim magazine, "My dad is definitely off his rocker, but in the best way. Like, one time I was asleep on the couch, and I felt something in my mouth. As I woke up, there was Dad zipping up his pants and holding a microwaved hot dog.

"Another time he sent my friends letters from the 'Health Department' saying they'd contracted a venereal disease, and they'd have to come in and list their last 10 partners. The funny thing was... people actually did it."