Most fun car I ever drove was a Dodge Sprint Car at Lime Rock. It was a rear mounted 2.0lt Dodge engine, with a straight 4-speed gear box. I tore Lime Rock up in that thing for a full day, what a blast.
The fastest car I think I was ever in was a buddies sprayed to holy hell 89 Mustang GT. I've never felt anything like that before in my life hitting the bottle on the highway and just that feeling of instantaneous power was overwhelming.
And hands down the best vehicle I have ever owned is my R6s, I put 5,000 miles on it in a matter of 4 months I couldn't get off the bike. Every day in the summer after work I was out with my friends tearing up North Jersey and parts of New York State. I came home every time with a grin from ear to ear.
My Z28 I can only tolerate in small dosages. A lot of fun times in it without a doubt but the instant I get stuck in stop & go traffic the fun is killed.