Last night I woke from a sound sleep to what I thought was an explosion followed by weird gurgling. It continued while I woke my husband to go see what was going on. He sleepily got up and checked out the house, but saw nothing. The next day he was in the bathroom and heard the same weird sound coming from the bathtub, behind the shower curtain. He was sure some nasty critter was back there, ready to pounce on him. Instead he found this old can squirting shaving cream up the wall. We left it there to continue it's upward journey, and it kept creeping up, making strange sounds, all day.