A1: Because they can spell it. A2: Because they can spell BWM.
Because people keep hitting them with dictionaries.
Her computer had a bug...
A rental car can drive anywhere.
An autumn-mobile.
RRRRRRRRRRRRRgh
With any luck you'll be able to get up for a spell.
Watching your mother-in-law backing up towards the edge of a cliff in your new BMW.
A pigeon can make a deposit on a BMW