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!"
Having two highly savvy internet surfers as children keeps me fairly well plugged-in to the latest and/or greatest stuff flying around online. These two usually already know about a video or photo or song long before it goes viral.
And, really, "going viral" is what it's all about...