Someone explain to me why a urinal cake would be completely missing from a bathroom urinal? Now I know that eventually the urinal cakes disintegrate and/or chip off over a very long period of time from people that urinate sand and small stones apparently. But there is no reason why a cake would be there in the morning and then not there in the afternoon. Especially when the cake is actually in a plastic cage. The only possible reason would be a change in cakes, but of course this would involved a cake replacement. You know, where a new cake (that isn't invisible) gets replaced with the old one. This brings me to the only conclusion. There is someone who thinks it's funny to reach into the urine infested porcelain manifestation, lift up the cake holder, grab the urinal cake and then walk out of the bathroom with the cake in his hand. While I find this much more disgusting than power peeing sand, it is unfortunately much more believable.