GiveBackFilms tips hard-working hotel cleaner $500

Kyle and Josh from GiveBackFilms, the YouTube channel that celebrates random acts of kindness, recently tipped a hard-working hotel cleaner $500.

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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Last fall, the YouTube Samaritans spent a day paying for strangers' gas. In another video, they paid for people's drive-thru orders.

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?