Today I learned (by dint of cutting into a really ripe one today) where a pineapple hides its seeds (just under its thorny exterior, in the little pockets in the flesh that correspond to the center of the "berries"). Did you know that pineapple's prime pollinator is the hummingbird? Or that it has mathematical properties?
I also wandered into a really neat category in Wikipedia on nonexistent people (such as the Alan Smithee credit for directors, which, I learned, requires the approval of a panel of the Director's Guild of America to use). A few favorites I'll share before releasing you to peruse the section on your own:
George P. Burdell, fictitious student at Georgia Tech.
Ern Malley, fictitious (yet well-loved) modern Australian poet.
Sidd Finch, April Fool's joke of a Mets rookie pitcher. (Okay, I admit, this one's primarily here for Mattchew's benefit.)
And finally, Fernando Pessoa, who was a real person, but who wrote as quite a few fictional poets, each with their own style and personality, some of whom hated the others. (He called them heteronyms... gee, I wonder if they're anything like certain remarkably autonomous Hall characters...?)