If this is not bogus, "tip" leaver needs some wall-to-wall counseling with the church elders.
I could easily believe it is real, though. Oh, the tract is real enough, but the conflation of the circumstances is overly cute.
http://christiandollarstore.com/montracpacof.htmlhttp://christiandollarstore.com/bibletracts.htmlhttp://www.familychristian.com/tract-cash-20-bill.htmlHere is a post about the ethics of doing this sort of thing and what to do if your Christian buddy does such a thing.
http://hereiblog.com/ethics-leaving-gospel-tract-tip/(Spoiler: Most popular answer is to go back, apologize for your friend's behavior, and provide a lavish tip.)
Were I to start leaving tracts about, I would order a pallet full of random Jack Chick tracts and leave them with good tips, among other places.
My wife
steals re-purposes my older wool socks and hands them out wrapped up with a tract inside to crazy street people. (Not Jack Chick despite my urgings. I keep telling her, "Too many words."). She was about to run off with my old mil-surp wool blankets, but I put a stop to that. "What the heck!?" The old wool socks were a compromise position. She then bought me knee-high+ wool socks that are supposed to go with hip waders, so all is right with the woolly world.