The Giant Outdoor Building Block Tower Game is a much much larger version of a similar, but much smaller tabletop game called Jenga, which I absolutely love. Basically the rules are simple, remove one of the wooden blocks, very very carefully, and place it on top of the tower without making it fall. The smaller version was scary enough waiting for it to topple over, this version could topple you right with it. Much more exciting.
Giant Outdoor Building Block Tower Game