Flying Fish. Rough, jolty, and boring. Thorpe need a better kiddie coaster.
Some could say the same about my Vampy (minus the boring) however I honestly have never once had a rough ride. Honestly. There is one particular jolt going over the rooftops but it doesn't hurt too much, sometimes though if I don't keep my head back I do hit it hard against the back of the train in the tunnel. My only complaint about Vampy is it needs padding.
EDIT: Fish also hurts my elbows, and shoutout to the Crazy Mouse on Brighton pier, the first ride I've ever been on where I genuinely feared for my life, and the first time my elbows have been crushed MORE than on the Fish.