A (newer) coworker asked if he could pick my brain about a certain part of our product. Sure, I said -- and I asked some questions to figure out what he already knows (or doesn't). We chatted a bit, and then I said "Ok, I have some homework for you -- please read X and Y before we talk".

He responded with "pop quiz next Wednesday at 3".

So I scheduled the meeting. I mean, wouldn't you? :-)