That big storm in southern Texas the other evening turned day into night. Freaky stuff.
I've seen something similar once, and only once: heading to my nan's house with my parents, around the year 2000. Even though it was the middle of the day (summer, I think), it turned into dusk... it was like driving at 4PM on a cloudy late November afternoon.
There was some epic hail and thunder from that, though, and of course it didn't last for long. By the time we were heading home (around 5PM) the sun was shining and you would never have known how dark it had been!
(And no, it wasn't the eclipse - I watched that from my back garden!)