Pentagon

A Pentagon is an extermely scray object in the BFDI universe, acording to Eraser.

In Getting Teardrop to Talk, Pen shows Eraser what he belives is a rectangle. Eraser than corrects him by saying it's a parallelogram, and he would know (since he is a parallelogram, too). Pen then shows Eraser a pentagon, and Eraser is imediatly terrified. Pen doesnt notice and comments on how "Pentagon" is his name (Pen) if you added -tagon. Eraser explains that pentagons are "extremely scary". Pen doesnt understand, until the pentagon intensifies causing both of them to scream. They call Blocky to fix the problem, who uses Saw to cut the pentagon into a quadrilateral and a triangle. Pen comments on how he never wants to see a pentagon again.

Trivia

 * In the closed captions, the pentagon says "Wanna be friends?", but it's likley that Pen and Eraser did not hear him say this as they are terrified anyway.
 * The pentagon has the ablitiy to make the world around him darker, and the music more intense.
 * However, this could just be in Eraser and Pen's imagination, as Blocky and Saw seem to not notice this change.
 * This could suggest that pentagons are not scary, but that Eraser and Pen have an irrational fear of them.