Want to stop your houseplants from dying from under or over-watering? Just pop your willy in a plant pot! Okay, wait. WAIT. Before you give us a big ol' slap, hear us out. We're talking about Willy the Worm Water Sensor! This clever terracotta fella is on a mission to make sure your houseplants remain well-watered, all you need to do is slide him into your plant pot so his friendly face is peeking out of the soil.