I was once asked in the middle of class to explain where I learned 'obfuscate' from, which was a White Wolf Vampire game, specificly a LARP. Not the easiest thing to explain to a group of people in a sentence or two.
I loved explaining why I knew what salubrious means, rather than try and explain it logically, I ended up making my self sound stupid.
Though I did meet another White Wolf player, which was a nice plus.
Oh, and when a professor overhears you talking about the Screaming Pelican, don't try to explain it.
DON'T. TRY. TO. EXPLAIN. IT.
On another note, I find people who believe that D&D leads to homicidal actions is ridiculous.
Even with Orphansbane running around.
As Malyss said, the amount of killers who have been players is very low, and these people likely ( read : have ) had other mental issues.
Of course, trying to explain mental issues doesn't mean much when my nickname is the School Yard Bayonet Killer.