"I'm really happy that car alarm went off just now." -- said no one. Ever.
If I could go back in time, I would un-invent car alarms.
Instead, I'd invent the StunnerMatic 4000 Xtreme (tm).
With this device installed, cars would simply stun anyone who was silly enough to do anything that would typically set off a car alarm. Yes, including people who set off their own car alarms. Because, heh, that'll teach you. ;)
*Also, cars would take a snapshot of whoever they stunned (in progress) and text the photo to your phone. So if there was a thief, you'd know right away. And if it was you, you'd have an embarrassing photo of yourself to remind you not to do what you did -- ever again.
RE: Magnavolt (Youtube)