"Ohh! There's a car behind us at Dunkin Donuts! Let's pay for their stuff!"
A whopping $3.84. The cashier was pretty amazed.
"Do you know them?"
"So cool!" I overheard her say "That lady just paid for their coffee...." to her coworkers.
She opened the window and asked if we wanted any donuts or a muffin or anything, which was really sweet of her!
Random Act Number 2 in the books. So simple.