In Terry Pratchett's Discworld books, the unusual vul nut vine is yet another consequence of the magical field which saturates the entire Disc. Due to an unusual four-dimensional twist in its DNA, the vul nut vine could be planted this year to produce fruit up to eight years earlier.

Naturally, this leads to some unusual complications in the harvesting process, requiring the grower to keep precise documentation about when a vine grew and flourished so that it would be planted later on at the correct time. But it was worth it, to those who could afford wine made from the vul nut, since it was said to bestow insight into the future to the drinker.

Of course, it also had the side effect of giving you a hangunder -- like a hangover, except you experienced it the morning before -- if you drank too much of it at a party.