This is *borderline* dirty but nothing explicit, only implied.
Two fishermen are out on the lake. One decides he wants a cigar. He says to his buddy "Hey, you got a lighter?"
"Oh sure, yeah, behind the tacklebox."
So he moves the tacklebox and he sees two things: The first is a lighter that is huge, it's ridiculous, as long as his forearm. The second is a dusty old genie lamp. While reaching for the lighter, he brushes up against the lamp. An ancient looking, geriatric genie with dirty gray hair and only 2 teeth pops up.
"I can grant you *cough cough* one wish!"
The fisherman doesn't hesitate. "I want a million bucks!" he shouts
The genie shakes his head. "What? I can't hear you."
The fisherman yells again "I want a million bucks!"
The genie shakes his head "You have to speak up I can't hear you."
Finally, exasperated, the fisherman screams "I SAID I WANT A MILLION BUCKS!"
The genie nods and says "Ohhh yeah, that's a popular one!" and he dissapears. A few minutes later, there is this monstrous flapping, hooting, quacking sound. A shadow descends upon the boat. The fisherman looks to the sky and sees what must be a million ducks, flapping pooping quacking and flying along. He shakes his head and turns to his friend.
"That genie of yours can't hear a lick! I said Bucks not Ducks!"
His friend starts laughing "Yeah, no kidding... you really think I asked for a 12 inch Bic?"