Start looking at sports cars. Browse eBay motors, research makes and models, stop by the dealership on the way home.
Start talking about hiking the AT. Read hiking blogs, research gear. Maybe even go for a day hike or two.
Let that go on for a good long while, maybe a couple months. Actually get yourself psyched up, if you can.
Then one day say, "maybe I'll just get a new, lighter MTB instead."
You'll be good to go.