Last night when I brought my bike into the hotel, I tucked my car keys in the waist band of my gym shorts and underwear.  Apparently I forgot to take them out of there once I got into my room, because I woke up this morning with a little soreness in that area.  I wasn’t sure what it was, so I reached down and sure enough, my keys were right there under me as I slept all night.  They left a nice imprint.