We've had all kinds of escape artists around here.
My brother once had a hamster named "Pedro." He somehow got out one night, and we searched high and low and could not find him. One night I was lying in my bed trying to get to sleep, and I head something chewing on the inside of the wall near my head. We ended up drilling a hole in the wall and laying out cheese, and taking shifts waiting for him to crawl out.
We also had a guinea pig baby escape just yesterday. My man was holding his favorite one, named "Smudge," and she was being the sweetest, calmest little thing ever. That is, until he went to put her back in her cage. She leapt at just the right moment and high-tailed it under the couch. You should have seen the two of us trying to corral her and shifting the couch here and there. xD
On a side note, I HATE HERMIT CRABS. When I was probably 12 or 13, I was "petting" mine, and out of nowhere it latched onto my finger. It was quite a sight, me hysterically bawling and running around with a crab attached to my finger, my mom frantically Googling "Hermit Crab Pinch Release Tips." Never again will I go near one. x_x