Happened to me today at Wendy's. Our Wendy's has HUUUUUUUGE drivethrough lines during lunchtime. I was sitting there inching my way forwards when someone stops in front of me a couple feet over, and turns on his left turn signal, then looks back to see if I've noticed. I was so shocked I just kinda waved him in, I had already waited for 15 cars, what's another 1? Afterwards I thought about it and broke up laughing.