My uncle actually did the same thing in the mid 90's. Went into a Chevy dealer wearing a suit and tie and a fancy watch, conned his way into test driving a Corvette and (I kid you not) told the salesman "It's nice, I'll take it" then proceeded to just drive off.
He drove it for about 11 months, he even registered it (somehow) in his name and the only reason he was caught is because a police officer thought he was a bit young to own a brand new Corvette (horray, profiling
For the record, I'm not bragging, the fact that I share blood with the guy is bad enough for me
Build Log (not much there yet): http://lotus.reddeth.com
442e frame, 3.4l Camaro donor