I remember left-handed lug nuts from the Dark Ages, when I was a kid, and my father decided it was time for me to learn how to change a tire.
Today, you still encounter left-handed threads in various places. One is in bicycle pedals; the left pedal has a left-handed thread where it threads into the crank. Early Italian bikes (to about the early 1980s) had right-threaded pedals, though. I had a 70s-era Colnago with those, and the left pedal was perpetually coming loose.