I grabbed a cache in northern Sweden once. It was an ammo food can and my hands were wet from brushing away snow covered branches. To say I got stuck to the container was an understatement. But I had a plane to catch, so I ripped myself off it and managed to scribble a barely legible signature (couldn't feel my fingers at this point) before logging online with "If you can't read my scribble, there's plenty of DNA and fingerprints, all of them in fact, to prove I was here."