What a wonderful effect in the gambling theme. This is 3 Ace Monte.
You take 3 playing cards from your pocket and say that you are going to play a gambling game: a kind of ball ball. But without money, because you are going to show that you can never win these kinds of games.
You show 2 white cards and 1 ace. It is the deviant card, ie the ace, that they have to keep an eye on.
Shuffle the cards and they will be wrong.
Even if you lay the cards on the table and shuffle the cards very honestly and calmly, they are wrong.
Then you remove a white card and do a 2 card monte. But even now they are wrong.
Then you say you are actually cheating and a fourth card is added. You now have 3 white cards and 1 ace.
Even now they do not find the deviant.
Finally, put 1 white card aside and show very clearly where the ace is. Ask them one more time where they think the deviant card is. They SEE him lying there and so they will have it right.
But... now fan out the 3 cards in your hand. THEY ARE ALL THREE ACES... The one deviant card is the white card that was on the table.
Very entertaining and surprising.
Easy to learn because of Ron's clear Dutch video explanation!
