You're under a curse such as: you may not bend your elbows. Or your curse may be that whenever someone says the name of a food, you must say "that sounds delicious !" Then your turn comes around and you're given a task to accomplish, say, trying to get another player to switch long distance phone services or to wait tables at a diner.
Catch someone not doing his curse and ring the bell. You are one step closer to winning. On your turn, after you accomplish your task (while remembering to observe all your curses), you get to draw and assign the next curse to the player of your choice. He could end up in a situation where he is supposed to explain to a cop why he was speeding while speaking like a grizzled old pirate "Avast ye Matey" and speaking like an upper crust Englishman. Contradictory curses, too bad.
Curses sets up some very, very funny situations. The more creative and uninhibited your friends, the more fun you will have. Cointains 120 game cards, rules, and bell to ring.