As with any numerous order in nature, the kingdom of pens contains a share of freaks and oddities. Sometimes, the mutation is useful and even attractive, as in the X-Men, while in others it is a mere deviation from normality, like a vestigial tail.
The Thing with Two Heads! Ouroborous? Hermaphrodite? Co-joined siblings? Who can say for sure?
The Amorphous Conundrum! Yes, it has a point, but not of gold, nor steel, nor any metal at all; its point is made of glass!
Half Pen, Half TURTLE! When writing, they might be taken for normal pens, but when at rest… the point withdraws into the barrel!
Born without Joint Threads! Barrel and section screw together… but how?