The weird reason UPS trucks almost never make left turns - Grunge It's information that, at first blush, seems to be what mainstream scientists refer to as "totally made up," but it's true: when at all possible, delivery drivers for the United Parcel Service (aka UPS) won't make left turns. "But why?" the layman might ask. Is it out of fear? Some leftover superstition from days long passed? A deep respect for folks like Derek Zoolander who, despite all their best efforts, just aren't ambi-turners? Prepare to be flabbergasted, because it turns out that the reasoning is actually grounded in genuine, head-scratching, non-whimsical reality. Get ready to have your mind blown by run-of-the-mill bean counting.