Not really at a car show but similar. One time a friend mine was helping campaign a mini rod tractor in tractor pulls around the country. At the time it was the greatest weight to hp ratio of any motorsport. Anyway they were running a Keith Black Olds 455 "Y" block, for a power plant. See the link below for details on the block.
http://www.s-series.org/htm/tech/GMP...ts/153-156.pdf
Anyway they just get the tractor off the trailer and this guy walks up in overalls and a big wad of Red Man tobacco in his mouth and says "what kind a motor y'all runnin in that thing?"
My friend replied, "it's a 455 Olds Keith Black Y block"
The man then replied" what'd y'all pull that out of?"
My friend wanted so bad to say "Delta 88 wagon!". But he didn't.