At the time I had mine removed, I had my home typing business. I had just gotten home and gone upstairs to try to sleep the rest of the drugs off, when suddenly one of my regular clients showed up, without an appointment. Seems she wanted a resume and ten copies done, and wanted them NOW. My grandmother tried to explain that I'd just been to the dentist and needed to rest, but I figured... regular client (she brought me essays to type every 2 or 3 weeks), and the first time I said "no" to someone could be the last time I ever saw them, so I mumbled that I could get it done.
No tip, of course (not that I expected them from everyone, but in that case it would have been the courteous thing to do).