Not going out with the guy named Robert that I worked with at a McDonald's in the early 90s. He was always asking me out, and me not being very trusting because of bad experiences that I had in school with guys making fun of me, I would never go out with him.

It wasnt until his last day at work and he was moving to Wyoming with his dad and he gave me his phone number and new address that I realized he had been serious about asking me out all that time...and then I lost the address.

and I cant remember his last name!

I've been kicking myself on that one for a looooong time now. (it's been about 18yrs) I feel really stupid that I never took that chance.