Maybe it was having a bad day. Maybe things are tough at home. Maybe the crab got a look at the photo above and decided that "If I'm going, I'm taking someone with me!"
I was told by my parents that I was, as a small child, quite the attempted-escape artist. The "attempted" part was added because I really wasn't very good at it. Tried to go over the rail in my crib. Failed, because of something called "gravity...