Watch her stunned reaction to the cash — carefully tucked into the unmade bed she was about to strip — below.
The humble cleaner initially tried to refuse the overwhelming gift, but both the GiveBackFilms crew and her co-worker insisted that she deserved it.
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And just before U.S. Thanksgiving, supermarket customers were given free groceries in a touching video.
It just goes to show how powerful good deeds can be.
If you had the resources, who would you tip $500?