My sister and I sat on the hood of an old Renault, while waiting for her friend, in Spiddal, near Galway City in Ireland, and dented the hood. (we didn't jump on it, honest, just sat!). It was a nice sunny day in May, and we had been waiting for a while and wanted a spot to sit. We weren't sure what to do, but decided to own up if he noticed anything. He didn't, until late that night driving across the Burren, and he spotted the dents in the lights from an oncoming car, and said "It looks like someone sat on the car and dented it"! A few months later, I heard that the suspension in the car had fallen apart, but by then I was out of the country entirely, and took no responsibility whatsoever.

In answer to your question, check for dents in the hood.