I had some people install a new water heater at my place. They turned off what was labeled as the water heater at the breaker and proceeded to change out the heater.

I noticed later that it seemed odd that the AC hadn’t cycled on all day. Eventually realized the circuit breaker was mislabeled.

The guys doing the water heater replacement were working on a live line and I guess they didn’t bother to check with a multimeter. Jesus. They didn’t get hurt/killed thankfully.