Play a prank on someone. Call them up and tell them ure an oap on a radio show that their gf/bf/friend dropped their number for a competition and they just won a free meal at a new Thai restaurant (come up with any name). Then tell them they on air and you would like them to express how they feel and guess who dropped there name. Tell them to scream it out and u can hardly hear them.
Then tell them they just got pranked. Thank me later