Why Was Dov Charney Expelled From Choate?

The fawning description of American Apparel founder and noted perv Dov Charney's "meteoric success" in Choate's alumni newsletter perplexed at least one of his former classmates person, who has tantalized us with this tip:

The strangest part of Choate's inclusion of Dov in the alumni mag is that Choate expelled Dov. I won't say what he did, but it was really gross and disturbing. I wonder if he'll be at the 20th reunion in May. We hadn't expected him because he was expelled...
Would any other members of the class of '87 would like to fill in the blanks? Please? Because probably whatever we're imagining is worse than what actually happened, and we're imagining it so vividly.

Update:
"He pooped in his cereal to frame another kid for doing it."

Earlier: American Apparel Was Born At Choate