While I have yet to engage in any Big game pranks, I do like to read about them.  Here are some stretching back into the 19th century. Apparently it used to be pretty common to start lots of bonfires around the streets of Berkeley, I guess they were like watch fires.  Both links are similar but each is a little different.

Big Game Pranks 1

Big Game Pranks 2

I also remember reading a really long and detailed history of the Axe somewhere, I'll try and dig that up and post it in the comments section.  Happy reading and Go Bears!