. . . behind me leaned on her horn because I was taking too long to place my order.
“Take the high road,” I thought to myself. So when I got to the first window I paid for her order along with my own.
It became obvious that the cashier told her what I'd done because as we moved up she leaned out her window and waved to me and mouthed "Thank you.", obviously embarrassed that I had repaid her rudeness with a kindness.
When I got to the second window I showed them both receipts and took her food too.
Now she has to go back to the end of the line start all over.
Don't honk your horn at old people.