After the police observed me on my belly feeling under a platform with my forehead 2 cm away from water, they stopped and asked what I was up to. I said geocaching and about 15 minutes later (so how do you find them, but how do you know about them, so who hides them, so do you take them away, who finds them, where are they, WHY?) they concluded I was cuckoo, but did offer to help if they weren't going home.
They were a couple of young fellas who were amused more than suspicious, and in suburban Canberra, Australia, a frumpy mum in her 30's on her belly on a platform isn't very threatening.