i have a theory about conservation of fun and inflatable things.

premis: every act of fun has an equal and opposite amount of misery.

think about balloons: kids love them, then they pop or get stuck in a tree (the balloons not the kids - have you ever seen a kid pop ? kids drink pop of course)

also applies to bouncy castles. there are always crying kids around bouncy castles, either from bashing in to people or from being told its time to come off.