Egyptian Ratscrew goes like this:
You divide the deck of cards in half, (half the deck for each player) and you see who has the highest card on the bottom. The player with the highest number goes first. That person lays down the first card, then the next player lays one down on top of that one.
!. If the first card laid down is not a face card, (e.g. not a jack, queen and king or ace,) then the other person just lays down the next card in their deck on top of it. Say the first card, (not a face card) was an 8. Then, if the next card laid down by the other player was an 8, both players try to slap the pile. Who ever hits it first gets to take all the cards in the pile. The person who took the cards then lays down another.
2. If the card they laid down was a:
Jack- they other person only has one chance to lay down another face card. (they cannot look through their deck, just take the one off the top.)
Queen- two chances to lay down a face.
King- three chances
Ace- the player gets to lay down up to four cards to get a face.
If you don't lay down a face card within the number of tries, then the person who laid down that face gets the pile of cards.
EDIT: 3. Oops, I forgot one more thing! Say someone lays down a 2, then the next person a 4, then the other person another 2, both players should try to slap the deck. Whoever slaps it first gets the pile.
4. The object is to get as many cards as you can- if you run out of cards you lose.

tee hee i felt like explaining that!
oh, and this is OPTIONAL: if you accidentally slap the pile of cards, but there was nothing to slap about, the other person gets the pile of cards