Reasons Your Vehicle Did Not Pass Tech Inspection?

I have an opposite story...

lived in So Cal, bought a stock 56 Ford Pickup, had to get it smogged once at purchase, brought it to state smog check facility, facility was an indoor type of facility, sat in passenger seat (that was the procedure back when) while tech ran engine up to speeds etc, room and cab filled with smoke, I asked how I got a waver, he said you don't need one you passed! Fell over laughing!