I think every school in the world has banned yoyo's at some point. I have a theory that yoyos exist in a time warp, popping out every so often pretending to be a brand new toy. And to children they are. They were new to me before being promptly banned by all the teachers. But it makes you think, they were probably new to people back in World War 2 as well. That is...before the Sergeant banned 'em. Effin Sergeants. Always banning the stuff we like.
In conclusion, the yoyo is a very devious toy. Claiming to be new and hip, then laughing at us when we get in trouble, only to jump back into the protection of their time warp. Effin yoyos.