When you could bring a toy like this to show-and-tell (which I did), and not have the entire frigging state go into meltdown.
I brought my Grandfathers Japanese WWII sword to show and tell.
As it was passed around the room a ruddy color started to come off on the kids sweaty little mitts.
We thought it was rust, but we determined that the blood runner still had 25 year old blood in it.
That was the best show and tell ever!