We had this game at my school called "Toilet Monster" which involved having one person (the "Toilet Monster") inside this pyramid-jungle-gym thing who would try to jump up and tag the kids hanging around on the outside before they would hit the top of the pyramid and "flush" him. It was a pretty unbalanced game because the Toilet Monster's odds were pretty damn low but none of the kids seemed to care.

Myself, I liked to stay indoors and play Word Munchers: