Buy a $5 sandwich. Guy making my sandwich remembers that I like a water cup with my meal, so I put $1 in the tip jar. It's not much, but I wanted to show a little appreciation before I walked out the door.
10 seconds later I find a $5 bill on the ground.
Talk about positive reinforcement!
Positivity pays.
"No act of kindness, however small, is ever wasted."