There are many versions of this funny trick, all of them with different endings, but this one is the classic, created many years ago.
A card is chosen and remembered by the spectator, then the magician shows a tray holding 3 big colored balloons and explains that the selected card will appear inside one of the balloons, the one selected by the spectator.
Just before he selects the color, one of the balloons becomes detached from the tray and hisses wildly into the air.
The magician continues and explains that the card will appear into one of the two remaining balloons. But before the spectator names his color, another balloon begins to deflate slowly, until it goes limp!
Finally, the last balloon explodes and the selected card in jumbo size appears in it's place.
'Comedy Jumbo Card In Balloon' is a top-class number for kids and adults shows.