My hamster, just strolling past on the floor. I scooped him up and saw that I'd left his cage door open.
How stupid can you get? Thankfully, no harm done and he seemed to enjoy his little jaunt. I shudder when I think of all the places he could have got into/stuck in, but all's well that ends well.
Another point to note is that the DC have always been very good about closing his door after play time. I don't think I will confess to them. They won't be impressed.