AKA: an unsuspecting spammer... only it's your mom, and she doesn't send you enlargement adds.
NOTE: The content of these emails can also include not so funny jokes, or mildly amusing/amazing photos.
"PLEASE FORWARD TO ALL OF YOUR FRIENDS."
"DOES ANYONE OUT THERE KNOW HOW WE CAN STOP THIS....."
"I'm not breaking this one. If I get it a 1000 times, I'll forward it a 1000 times!"