Karma Dollar

Noun: a variation of the "Lucky Penny"
When you randomly find a dollar bill on the street.
To have good karma, you need to use it in a good way like tip a waiter or charity and so on.
It is also recommended that you commit a federal crime by writing "Karma Dollar" somewhere on the bill.

I gave a homeless guy my Karma dollar and the next day I totally got lucky on a test.