I heard the circle the fat rumors at IU...the Zetas were the ones who supposedly did it. (Not true according to the girl I knew who pledged freshman year.)
The elephant walk rumor I heard about two different houses that got kicked off campus for hazing. No idea how true that is...it's not something I wanted to ask.
I know the Phi Beta Sigma chapter at IU does brand their members...I've seen some of them with the Sigma branded onto their forearm. Gave me the creeps the first time I saw it.