I'm pretty fond of prank phone calls (I plead the 5th

).
I get a big kick out of the following one done by Elvis Duran and the Morning Zoo Show in NYC and Miami where they wound up an Irish guy who was looking to get his name on his child's birth certificate but couldn't under NY law because he wasn't married:
YouTube - Indian Irish Phone Call
This is another link to it that isn't as clear but where you hear the initial radio jockeys explaining the background of the setup:
YouTube - The Funniest Irish Prank Call Ever - America
This one by a young Irish girl is a cute one where she calls a demolition company to knock down her school, and the group on the other side went along with it for laughs:
YouTube - Hilarious Prank Call Funny Ireland Irish