I have to "fess up" also. I've done this with disastrous consequences....
'Twas the day of my daughters wedding. I had made the wedding cake.
I had to deliver it to the venue and assemble it and then rush back for photographs - and it was absolutely pi55ing down...
I parked in the venue carpark and rushed out with the 3 tiers of the cake - spent about 20 mins assembling it. Then leapt it the car forgetting that I had left the tail gate open, and reversed into the side side of a barn. OUCH
Ironically having a bike rack on probably contributed to this because I had got into the habit of using the wing mirrors - so everything looked OK when reversing. But there was so much rain I could not hear the engine let alone detect any outside noise to alert me to my impending doom.
A bloody alarm would have prevented this !!! as you say everything else is alarmed.
A day I won't forget .......