reverstrophe
A reverstrophe is what happens when you have a great plan that backfires. The end result: exactly the opposite of what you intended.
I set up Bob and Sarah on a blind date to help Bob move on after his break-up with Anna. When he got a whiff of Sarah's perfume and realized it was the same that Anna used to wear, Bob spent the rest of the evening crying in the bathroom and leaving messages on Anna's phone. What a reverstrophe!