Car alarm goes off

A car alarm is an electronic device installed in a vehicle in an attempt to discourage theft of the vehicle itself, its contents, or both. Car alarms work by emitting high-volume sound (usually a siren, klaxon, pre-recorded verbal warning, the vehicle's own horn, or a combination thereof) when the conditions necessary for triggering are met, as well as by flashing some of the vehicle's lights, and (optionally) notifying the car's owner via a paging system and interrupting various electrical circuits necessary for the car to start.

I apologise to my sister for setting the alarm when she is still sitting in the passenger seat and I left her there and went into the store to get milk and coffee and cream and she moved and set the alarm off and everyone was staring at her while the lights were flashing and the alarm was blaring away for 20 minutes. Hilarious, unless you were my sister