Video footage shows the moment a man rips off a car door handle after a family firework event, before lying down underneath the car.
Luke Fish, 26, was with his three children on Monday night when he found the man acting suspiciously around his car after the display at Trago Mills in Merthyr Tydfil.
The video, captured by another visitor, shows the moment the man snaps off the door handle of Mr Fish’s Renault Laguna and then falls onto the floor.
He is later seen lying on the floor under the car.
Mr Fish, from Aberfan, said: “I was concerned for the safety of my kids. I thought I’d better not confront him.
“My oldest is almost six and he was kind of scared. The others didn’t really know what was going on but my oldest saw what happened.
“He was swearing and telling me to go away and the next moment he was on his back sleeping.”
The dad called the police and officers arrived.
A 32-year-old man was later arrested at the site in connection with an allegation criminal damage and remains in police custody.
Mr Fish added: “I was lucky my ex-partner was there and could take the kids away. It could have been worse.
“You don’t expect that when you go out for the night. Before that it was lovely, everyone was enjoying the fireworks, having a laugh, and going on the rides.”
The bakery factory worker added: “I don’t know what he wanted to do. He snapped [the handle] off. The police have got it as evidence so I’ve got to replace it.
“I had work at 10pm [that night] and I had to take the day off because I had to go to the police station so I lost a day’s wages.”
Another visitor who captured the footage said: “I was on my own with my daughter. It was a bit shocking. Luckily the car owner came over and rang the police.”
A spokesman for South Wales Police said: “Police arrested a 32 year-old man in connection with criminal damage following an incident which occurred at the Trago Mills car park at approximately 8pm on Monday, October 29, 2019.
“Officers were called to car park following reports that damage had been caused to a car. The man, who is from the local area, remains in police custody.”