I did puke in the Gym once... Not from a crazy "leg session" though.
I had drank this big thing of Orange Juice, and I guess when you do that, and workout and maybe up your body temperature a little bit... Well, the OJ just doesn't want to stay down.
That's why I don't drink OJ before lifting anymore.
I think when it happened to me it was actually chest day or something.
I agree with everyone else... Puking in the gym is not "hardcore".