Interestingly, I used to have a 433MHz wireless doorbell (a "1byOne", specifically) that would spuriously chime every time a specific one of my neighbour's cars

Interestingly, I used to have a 433MHz wireless doorbell (a "1byOne", specifically) that would spuriously chime every time a specific one of my neighbour's cars set off. I assumed it was interference from some sort of PIR motion detector transmitting a signal to say it saw some motion, but I suppose it could conceivably have been caused by the car going into reverse. I never debugged it, I just threw the doorbell away and bought another.