From an employee standpoint, I can see fw's point. I work in a supermarket, so if I saw some shmucks having a grape fight in the produce section, or rolling around in a wheelchair (as my one friend did), I'd have a problem with it.
thats wrong too; its ruining a product and making a mess
I dont see whats wrong with playing hide and seek though :P
And either way he got punishment so :3 I unno i dont think its so bad, even having been an employee at places people did stupid antics at, but I always laughed and just asked politely for them to stop, because I had to; otherwise it always made me smile and made the work day a little better