The server will be forced to look up the currency (if it is easily identifiable), exchange the currency, only to find out they got a shit tip.
I had a delivery driver a while back, who looked like a normal ass dude and I asked him if he had change for a five. This poor dude pulling out his wallet barely being able to grab on to the singles, my Grinch heart almost lost it's composure. I was actually going to give him the 5 but then it would defeated the purpose of his struggle, and it was too late when it dawned on me. How fucked would it have been if I just handed him back all the money? lmao sorry Satan I'm making it up to you with this post