I'd say it would have to be the Romeo Y Julieta Churchill I have had sitting in my humidor for 9 years.
I brought a few back with me from Malaysia in 1999. For some reason I never smoked it. I forgot to smoke it on my wedding day and smoked something else, I got so wrapped up into the parenting stuff when my daughter was born, I forgot again.
Now I don't smoke it because I can't think of an occassion special enough to smoke a 9 year old cigar. I have alot better cigars in my humidor, but for some reason I won't smoke that one.
Sanchopanza (Stephen) keeps telling me I'll end up smoking it in the parking lot of a McDonalds.
Last cigar ever though...that might justify smoking it.