This is a quick trick that lets you
1. use an audience member,
2. make them pleasantly
uncomfortable (which is entertaining to the rest of the audience), and
3. hit an exact
prediction that looks impossible.
Doesn't take too much time to 'craft' your gimmick and
is SO easy and quick to learn and keep in your arsenal.
PS. You'll need to 'ruin' extra
decks but most of us have plenty of extra cards anyway!