People who spend 10 minutes in line and only start deciding what they want when they reach the register
This drives me absolutely insane. You've been standing in the same line as me for the last ten minutes. The menu is six feet tall, directly above the counter, brightly lit, and has not changed once during that time.
Yet somehow the second you finally get to the register it's suddenly "hmmm... what do you guys have?"
Then comes the full investigation. "What's in this one?" "Is that spicy?" "Can I get this without onions?" "Wait, what size should I get?"
Meanwhile everyone behind them is watching their lunch break evaporate in real time.
Bonus points if they finally order, the cashier gives the total, and THEN they start digging through a bag looking for their wallet like payment was an unexpected part of the process.
I completely understand taking a minute if the menu is complicated or you've never been there before. I'm not expecting people to memorize their order before entering the building.
But if you've had enough time in line to scroll through Instagram, answer three texts and stare into space for five minutes, maybe use 20 seconds of that time to decide whether you want the chicken sandwich or the burger.
Please. I'm begging you.