Yep. We were once out and his very tired chain snapped. I repaired it with a quick link (he had no tools of course) and we managed to get back ok. The following week his chain snapped. What bad luck, I thought, a new chain snapping. But of course it wasn’t a new chain, he hadn’t bothered replacing the old one which had more quicklinks than normal ones.
He also once turned up for a weekend away two spokes short in his back wheel. He hadn’t noticed , he said…..