I heard this one on the radio listening to an oldies station (50's, 60's, 70's music) because they got rid of all the Metal Stations.* \m/
Anyway, they had a phone-in contest, called "Make Us Groan" (or something equally stupid).
This guy calls in and says he has a joke...
There's a man sitting on the couch watching TV and his girlfriend comes down the stairs with 2 suitcases.
The man jumps up and runs over to his girlfriend and says, "What are you doing? Where do you think you're going?"
His girlfriend replies, "I'm leaving you."
The man says, "Why?"
His girlfriend replies, "I heard that you're a paedophile."
The man looks at his girlfriend and says, "That's an awful big word for a 6 year old."
The DJ's were stunned- there was like 10-15 seconds of just dead air.
I damn near wrecked my truck laughing so hard.

They NEVER held that contest again.