Floating Eyeballs are creatures detailed in Journal 3. They are visible during the night only, appearing as glowing yellow orbs with black pupils. Despite the pencil drawing, the book's text indicates that they have no retinal cord. On their page in Journal 3, "does not respond to contact" and "spooky" have been crossed out. Journal 3 also says that they "watch" you, indicating that they can move. They were pictured in "Tourist Trapped," and appeared in the "Fright Night" online game. However, a glass jar containing what could possibly be the eyeballs are shown in the opening theme.
In "Tourist Trapped," when Dipper is going through some of Journal 3's pages, their entry is briefly seen.
In "Scary-oke" under a black light, further information is revealed in invisible ink. The page is now titled "Floating Nonsense". It says "I was wrong to worry about these things! They are nonconsequential!" and "Pepper spray makes 'em go away!!!" The eyes in the top right corner of the page are now crossed out.
As their name implies, they're floating eyeballs. As written in Journal 3, they have no retinal cord. In the upper left picture in Journal 3, they appear to be eyeballs with veins and retinal cords. In the lower right corner, they appear to be bright eyes on a dark background, possibly glowing in the dark.