It is amazing some of the weird and outrageous ideas that people come up with. The sprinkler idea however is actually a pretty cool idea. Because let’s face it, the key under the rock, or the key behind the loose brick and the key above the door has been played for years now and i would imagine all perpetrators these day’s have by now figured out to look in all these common places. but if you have it in a sprinkler and you have say 20 sprinklers in your yard…which one would it be under? i’m sure by time they found the spare key, someone would have seen them snooping around and ripping apart your sprinklers by then. :)