As far as I know, flash fiction are really short/brief stories. I think they are technically 1000 words or less, but I usually see them under 700 or under 500 words.
[Griffinkeeper] 10:45 pm: The guard appears "We have weasels now!" [Firearris] 10:45 pm: askes the guard for the weasel! [Griffinkeeper] 10:45 pm: The guard gives Firearris the Weasel. [Firearris] 10:46 pm: aquires the weasel and renames it "Cat" Take that, Lumi.
The simple truth is that authors like making people squirm. If this weren't the case, all novels would be filled completely with cute bunnies having birthday parties. — Brandon Sanderson, Alcatraz Versus the Evil Librarians