I recently watched “Brief history of the Wrong Earths” by Hardcore Sci-Fi, not many of these are well known so you could have so much more ammunition for fooling around like that with people.
“flat earth? Nah, it’s expanding bro! Oh wait actually it’s 9 hollow earths one in another!”
Try to stab something with this monstrosity and it’s guaranteed to get stuck between the ribs or in other bones, leaving you without a weapon.
Historical swords aren’t spiky for a reason