So, one of my co-workers is taking some classes right now, and she's having me proofread her papers before she turns them in. Better yet, she's paying me to proofread them - which wasn't my idea. (She says she feels more comfortable doing it this way. I say, "Well, sure, force some extra cash on me, then.")
So, early in the week I get a paper in my e-mail. I go over it, looking for errors in spelling or grammar, poorly chosen words or phrases, and sections where her meaning isn't clear. The class appears to be on urban development and land use, so it's actually pretty interesting stuff to read.
Most of the rest of the department doesn't know that my co-worker is taking this class - or in school at all, really. And, gossip being what it is, she isn't particularly eager for people to find out. So each week, a day or two after I've sent back her heavily-commented paper, she comes by my desk and hands me an envelope with some money in it.
I'm just waiting for someone to ask me if I'm dealing drugs, because I swear by all that's holy, that's exactly how this looks.