Scenario (purely hypothetical, of course): I find a decent pitcher on the waiver wire. Put in a claim. Then I read on the World Chat that his owner dropped him accidentally, meaning to waive someone else.
I end up getting the pitcher. Then his former owner contacts me, says again that he accidentally waived the wrong guy, and wonder if I'll help him out by trading the guy back.
What is my obligation here? I know I don't have to trade the guy back, but am I being a jerk if I don't? I mean, of course I'd trade the guy in a good deal, but I'm not sure if this other (hypothetical) guy has a good deal in mind, or if he wants a new-guy-who-goofed-up discount. Which of course, since this hypothetical situation is in World Foxx, would surely get vetoed, so perhaps I've answered my own question.