Lemons

Overview
Lemons are the longest lasting, and most grotesque, meme of the Lemonade Stand. They are often traced from photos of lemons afflicted with citrus bud mites and edited into an amalgamation of various characters and species, all mashed together into a being with only one purpose: to assimilate.

Oddly enough, these monstrosities were the original inspiration for the comic Seeds of Dissonance. Make of that what you will. It is not currently known how lemons in the comic differ from the lemons of old.

Origin
Snaps is too lazy to dig up and screenshots or dates, but the original incident went something like this...

Tropic posted this lovely image. We all shared a laugh. Snaps posted this edit (featuring the cast of PMD: Evolution). We all screamed. The lemon has been a staple of the server since, bringing delight and anguish in equal measure.