I work in a professional capacity serving the public. I've been working at this place for about 15 years now. Once, in all those years, someone slid me a tip. A generous tip. I didn't know whether to be pleased or offended. Don't get me wrong, I took it, I just didn't know how to feel about it.
Remind me sometime to tell you the story about this dude who wanted to slip me a different kind of tip at work.