Ha ha, what a great little guy! It doesn't hurt until they actually try sticking your fingertip into their mandibles.
He started out as a wee little thing scuttling around behind his dad, Lobstrosity. Sorry for the streaks, but it was a must-snap moment!
And fast forward to now. Here's Big Red, fresh out of a moult (which is why he's not very red). I am guessing he's a Procambarus clarkii, since his mom and dad were rescues last December from the local farmer's market seafood section.