A guy told me that he did this one .
It's funny, but kind of mean.
When in high school, him and his buddy would pick a phone number from the book and call....
"Hello, this is Bob from the phone company. Is this Mr. Wilson?"
"Yes."
"Mr. Wilson, we were outside your house today, and installed some extra wire on your phone, but we couldn't get inside, to take up the slack. Can you just pull the rest of the slack wire inside please?"
"Uh, OK. ........ It doesn't seem like it wants to give."
"Well, Mr. Wilson, you have to pull it really hard."
"Well,.... I'm pulling on it, but it's not giving at all."
"That's OK, you have to pull it really hard. Just lay the phone down, and yank it really hard. OK?"
"Uh... OK. Hold on just a minute."
Silence
"CLICK. Buzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz"
That's mean.
Wish I had thought of it.