In Germany, we have two rtather nasty sayings about law students:
You can study law either by investing much time or having much brains. Most law students are therefore rather busy.
Two left hands? Study the rights! (Won't translate properly, in German, the terms for law and right hands are the same).
But I'd proceed as AO1 proposed. Their behavior could also be a sign of wanting to include others into the conversation, and of course, everybody likes to talk about things he is familiar with.
In my experiece, students of philosophy, theology and history do not talk that differently on a student party.