Get a 5-10 pound bag of long grain rice and some small safety pins. Pour the rice into a large bowl or jar and mix in the safety pins. Now there are two ways to play this game; play it straight, or for fun, make it a gag game.
Play it straigh: Mix the safety pins well with the rice. Each guest needs to fish out as many safety pins as she can in a span of two minutes. It sounds easy but if you actually try it, digging through rice hunting for a safety pin is very difficult. To really make it challenging have the player wear a blindfold, too. The player who finds the most in two minutes wins.
The gag version: Tell the guests they need to find the safety pins BUT don’t put any pins in there at all! Just for demonstration sake, sneak a pin into the bag, act like you are fishing around and “find” the pin. Then let the guests take a turn each. When the first few guests can’t find a single pin, their reactions will be worth watching. Of course, after 2-3 guests, the rest will catch on. For being good sports you can give prizes to the ones who “played.”