This was true when I was in school, a long time ago.
Engineers could only party on the weekends, because they always had homework to do.
Architects couldn't party at all, because they were always in the lab.
Liberal arts majors were the most fun... They could always party.
Then, at least in my peer group, quite a few of them went to law school and "buckled down"... Now they charge me $250 per hour to review a stinking form contract.