my cat used to jump in behind the fridge. It's not an easy spot to get into, you'd have to jump around the counter and the opening's no more than 8". She wouldn't come out so I'd have to pull the fridge out. the hole's since been blocked off.

She once was locked into my dresser drawer once for the whole day. I had a drawer open and she jumped in behind the drawer and I shut it on her! I was looking for her for quite some time after I got home from work when I heard rattling coming from the dresser!