Not sure where it's from but I've received a bill like that from someone I really cared about a long time ago when I had a bit of a serious drinking problem. I was also homeless at the time.
The $20 bill said, "Not for alcohol," on it. And the look in their eyes pleaded, "please."
When I was at the liquor store that evening and I went to pay I didn't have enough unless I spent that $20. I picked something different and used that money for food that night.
I'd like to say that was the first step in me getting sober but it was a few years later when I finally quit drinking.
6 years sober now.
I really wish I could remember their face.