You've Got Crabs by Exploding Kittens
You’ve Got Crabs is a team-based party game from the creators of Exploding Kittens and The Oatmeal. Try to collect four of the same card before any of the other teams, then pass a secret signal to your teammate. If your partner sees your signal and yells, "You've got crabs," you GAIN a point. If an opponent sees your signal and yells, "You've got crabs," you LOSE a point. The team with the most points wins the game.
This game is great for parties, or weddings, or long nautical voyages.