Game of the day

We played this game during exam supervision sessions to pass the time:

Game name: Slap

Equipment: 52 card deck

No. of players: 2 to 5

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Instructions

1. Shuffle the deck and deal the cards evenly. (It's okay to have one card extra if say 3 players are playing.)
2. Organise into a pile, but do not look at the cards.
3. Each player takes turns to flip their card and put in the centre. As you flip the cards, you have to shout out a number - the first person shouts 1 or A, second shouts 2, third shouts 3, then 4, 5, 6, 7, 8, 9, 10, J, Q, K, back to A etc.
4. If the shouted number is the same as the flipped card, then you have to slap the card. The first person to slap the card gets all the cards in the centre pile. E.g. when shouted number is 4, flipped card is 4, you slap the pile
5. If you get all the cards, you win. (Note: that way, those who has no cards can still play.)

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Variations to step 4

1. Silence: do not shout, but keep track of the numbers in your head
2. Plus one minus one: e.g. if shouted number is 4, slap when flipped card is 3 or 5
3. Reverse: start with K, then Q, J, 10, .... 1
4. Challenge: Square for 1, 2 and 3 (so 1 corresponds to 1, 2 to 4, 3 to 9), plus one for 4 to 10, and minus one for J to K.

Can you think of any interesting and thought-provoking ones to add to the list?