Some memorable ones in an uncontrolled (not a track) for me:
MB S600 was over 180 mph before that was enough on a freeway, that car had the electronic limiter removed and I'm not sure why.
Nissan pickup 4 cylinder was over 120 mph (going down grade with a good following wind)
In high school we had a friends moms rusty rattle trap K car over 70 mph and it felt like that car might break apart.
Several motorcycles over 130 mph, at some point around 100mph it just doesn't matter on a bike, you crash and you'll probably die.
US Naval warship somewhere over 40 knots, the actual speed was classified.