(Yes, it's biting me ... no, it doesn't hurt)
My 7th graders, each year, breathlessly tell me, " Mr. FC, did you know the most poisonous animal is the Daddy LongLegs ... only his fangs are too small to penetrate human skin!"
So every year, I ask them why an animal that feeds on a mix of very small critters and detritus would need such a super venom and we work our way to the realization that this is just one more Rurban Legend ... just like "Mr.FC, did you know your blood is really blue inside you and it turns red when it hits the air!" (There's a teacher at the Elementary feeder school across the street that perpetuates this .... arrrghh.)
We work through that one too.
I have heard of a thing called a "ROOMBA" that reportedly cleans floors all by itself. I think that is probably an urban legend, but I do have confirmation on a related Rurban Legend that seems to be true.