My friend Matt and I (and sometimes some collaborators) loved elaborate multi-call pranks, e.g., one of us calls some random dude, asks if he has "the stuff"; random guy doesn't know what he's talking about. Caller gets agitated, even abusive/threatening, before hanging up. 20 minutes later the other one calls the same number claiming to be the police, says something like "we found this number on a suspect we apprehended; what is your connection to Larry 'The Maggot' Pasachoff?" Of course they know nothing but cop pushes them for information ("You sure there's *nothing* you can tell us?") before hanging up, vaguely disappointed.

Another time we called a house that we knew the street address of... claiming to be cops. ("Sir, look outside your window. Do you see a white Toyota?") Somehow we had rigged up some kind of signal (this before cell phones of course) with friends outside the house, of course in a white Toyota. The cop goes on to say there's a very dangerous criminal in that car; the citizen should remain inside. Guy in car gets out, is violently apprehended by two *more* collaborators (more "cops") as the citizen, watching the whole thing unfold out his window, flips out. ("Oh my god! They've got him! They're arresting him right now!" Phone cop: "Yes, those are our men. I need you to remain in your house at all costs. He may have accomplices in the area...") IIRC, the "cops" were none too gentle with the "suspect", as the action was breathlessly reported over the phone by the citizen. I forget if we had any real ending to it, just something like "Stay safe, sir, and report any suspicious activity to the department."

Ultimately, they weren't prank calls where we tried to make people feel stupid, more like little plays we would create that roped unsuspecting folks into the cast.