LOL! That would probably be a possible reaction as well. The vapor locked is a local euphemism for heart attack. The back story is long but I'll give the condensed version. In my 20's I was a volunteer fireman and first responder. I was at a Christmas party wearing a t-shirt that had a slogan on the back that said "It's not nice to fib". An old retired mechanic that was attending the party didn't get the play on words. When he asked what the significance of lying was to the fire department shield on the front of my shirt, I explained that the "fib" was short for ventrical fibrillation. The next question of course was what's that? Now what I should have said is "heart attack". But no, I gave a long winded explanation of how the heart goes into a sort of spasm that disrupts blood flow through the body and brain. He intently listened to my lengthy and detailed explanation and then said, "So fibbing is basically like a vapor locked fuel system. Sounds like a heart attack." Well it stuck. So now, in my area some 20 yrs later folks still refer to a heart attack as vapor locking. Sometimes I forget that my local colloquialisms are not universal. My apologies for that. Josh