Just had a faux pas at one of those double-car McDonald's drive throughs

Just had a startling incident going through one of those double-line McDonald's drive throughs. I ordered my food on the outside lane, and, when pulling around, quite inadvertently cut in front of a gentlewoman who was in the inside lane. By the time I realized what I had done, it was too late. There was already someone behind me, so I couldn't back up. She rolled down her window and let loose quite a rude string of expletives at my expense. Indeed, once I got to the window to pay, she started accosting the McDonald's employee who was taking my payment, insisting that I was in fact taking her food. It was quite embarrassing for all involved. In fact, I had ordered a small water and, lo and behold, I received sprite instead - no doubt intended for the enraged diner in the car behind me.

Please folks, observe drive-through etiquette so you don't end up in a similar situation, on the losing end of an exchange with the hoi polloi.