When I was younger, I managed to find one (I dunno if it was a tarantula or not, but it was definitely tarantula-sized) in a fairly odd place. A couple of us decided to play a board game and when we were done and I went to pick up the top of the box to pack it up this huge, unexpected bastard started moving towards us. It was big enough that its movement was audible when its legs plucked at the carpet and survived a stomp from my 6'3 220lb uncle. I assume the thing had managed to find its way into the closet where it made the box its home and somehow managed to stay in the lid when we took it off and set it to the side while we played. That's not exactly how you expect to find a large spider like that.