Kemps

Google says, "Kemps or Scenics is a matching card game for two to six teams of two players each. It is played with a standard 52-card deck."

each player gets a partner and sets up secret signals to tell the other when to say "kemp". the goal of the game is to get 4 of the same card, and get their partner to say "Kemp". if someone has 4 of the same card and their partner says "kemp", then that group gets a letter(starting with K, then E, and M, then finally P). whichever group gets "K-E-M-P" first wins. theres another twist to this game, if a person suspects another person having 4 of the same cards, they can yell "stop kemp". if the suspected person does in fact have 4 of a kind, that group loses a letter. but if they dont have 4 of a kind, the group who yelled "stop kemp" loses a letter.

this game rocks

See this page for more detailed rules