Stop Me If You've Heard This One.

A little boy walks into a whore house dragging behind him a dead frog, on a leash. He says to the madam "I'd like your filthiest, most AIDS-ridden whore please"
"Young man" the madam responds "why on earth would you want a dirty whore?"
"I've got money" the boy exclaims as he slams a thick wad of bills down on the desk "and I'm not leaving here until I get AIDS"
The madam, needing the money, directs him to a room at the end of the hall, the boy, still dragging his frog, goes to the room as prompted
...About 20 minutes later, the boy goes skipping back out of the brothel, frog in tow, big smile on his face.
"Did you get what you came for" the madam inquired as the boy passed
"Oh yes ma'am, I've got lots of AIDS now, I'm sure"
"But why on earth did you want to get AIDS? Don't you know they last forever?"
"That's the point!" The boy exclaimed. "Now in gonna go home and give it to the girl next door, then when her dad comes home, he's gonna get it from her, then her dads gonna give it to her mom."... The boy continues "then when he goes to work, my dads gonna go to the neighbors house, her mom will give AIDS to him, then later, my dad will give it to my mom"
Mortified, the madam cuts in "why would you want to do that to all of those people?"
"Im not done, every couple of weeks, mom gets packages from the UPS guy, and when he comes back, she's gonna give the AIDS to him, and THAT'S THE SON OF A BITCH THAT RAN OVER MY FROG!!!"