The local McD's drive thru has a giant LED screen where you can see your order and total cost. Very nice for confirming they understood what you ordered after:

Me: 3 Big Macs and 2 large Fries

McD: What?

Me: 3 Big Macs and 2 large Fries

McD: 4 Quarterpounders?

Me: T-h-r-e-e B-i-g M-a-c-s

McD: 3 Quarterpounders?

Me: Yes, and fries