What are your greatest regrets regarding: (A) An item you passed on, and later wished you had bought, and (B) An item you sold, and later regretted? I'll start. (A) After selling off almost my entire collection, I came across a Gillette razor blade dispenser for $150. These existed before my time, but you used to find them in public restrooms, and a traveler could purchase their favorite blade if they ran out. I didn't buy it because "I was done acquiring." (Yeah. Right.) By the time I went back, it was gone. (B) I had three Gillette Psychos, in their box, with an original key. Best conversation pieces ever. I sold them. I regretted it the moment I took the guy's payment. Let's hear your stories of regret!