Those became the modern "slug bug" for my friends and I while we were teenagers. Beavers, they were called. One is spotted, "Beaver" is shouted, and someone gets punched. Good times for everyone 
And then there was the the slight variation called the Grover. That was the grocery getter beaver. :lol:
And then there was the the slight variation called the Grover. That was the grocery getter beaver. :lol:
