"The clerk told him it was so early that she didn't have enough change in the register and could he wait while she went to the back office safe. But Ben told her, 'Don't bother - you keep the change'.
She balked at first, but when Ben insisted, she said, "Wow, that is so nice of you! My mom's visiting form Winsconsin, and I'll take her out to dinner with this," a source said.
Affleck is not the only generous star in Hollywood. Rihanna has been known to tip a waiter $200 while George Clooney paid for a nearby table's dinner at a Berlin restaurant simply because he thought he and his friends were being too loud.