An old woman is sitting home alone one day when the phone rings.
"Dis is da viper... if come for you soon, yah?"
Thinking it a prank, the woman hangs up. The next day the phone rings again. "Dis is da viper... I come Vendsday. Start from top, go down."
Again, the woman hangs up the phone, although now she begins to wonder. Sure enough, the next day..."Dis is da viper... I arrive tomorrow. 3:30. Have 45."
The woman hangs up the phone and calls the police. Sadly they inform her that they can't do anything unless he actually threatens her. The next day the woman's pacing her apartment when there's a knock at the door. She picks up a fire poker and looks through the eye-hole on her door. She lets out a sigh of relief when she sees a little old man with a bucket outside the door and unlatches it to see what he wants.
"Guttentach, I am the viper." The woman gasps. "I come to vipe and vash de vindows. I start at top floor, go down. You have 45 dollar, yah?"