Jet-ski and motorbike damage claims
Phuket, Pattaya, Koh SamuiVery commonYou return a rented jet-ski or scooter and are shown scratches that were already there. A large cash sum is demanded, sometimes with police or heavies present, and your passport is held as leverage.
How to avoid it: Never hand over your passport as a deposit — use a photocopy or cash deposit. Film a slow walk-around of the vehicle before you take it, including timestamps.
Sources UK FCDO Thailand safety and security r/Thailand rental scam threads