potato
I've never quite figured this one out, and I never did ask, but... one Christmas, my last year of highschool I believe, two of my friends gave me a copy of The Joy of Sex II (which I only looked at once or twice, by the way). That's not the odd bit though... the odd bit is the baked potato they gave me with it. Uncooked. Still in the shiny foil wrapper from the grocery store.
I didn't regift it. I ate it.