For me, Clinique Happy. My man wears Happy for men and I finally decided to try Happy again because he said he liked it. I wore it 3 years ago. A co-worker wore it so I stopped because it reminded me of her. Crazy, I know.
Victoria's Secret 55 perfume. I bought a bottle right after it was discontinued, and then never wore it. Now I just found out that they're going for around $200 per bottle!! I started wearing it every once in a while now.