Me and my friends always pretend to be other with different accents and call ppl from our school asking for money, a person, love, advice or something stupid like rsvping for a bday. When we do the rsvp thing we always say random stuff like "My daughter talula cant get in 20 feet of a boy and has to wear her chastity belt!"
Or we pretend they won money and they have to go to the park or some where in the neighborhood. Then we go there and see if they show up. And they do ah aha.
Or we pretend to be a five yr old calling her friend for her crayons, a lady name jen from planned parenthood confirming your condom purchase, and old lady ordering viagra for her hurband and explaining her sexual fanatsies, etc we are weird!