Secret 'stache

I've made a habit of watching Jeopardy! recently. I was obsessed with the show back when I was in high school, but have caught it only sporadically since then. I'm sure one of the reasons for my renewed interest has to do with record-breaking champion Ken Jennings, whose blog and forums are a safe haven for closeted trivia nerds like me.

Someone on the forum alerted me today to a temporary, perhaps April Fool's related return of host Alex Trebek's beloved silly divisive moustache mustache hairy upper lip.

I wanted to see it, but I needed to screencapture it. Sure enough, it's there for the first round...

...but gone by Double Jeopardy! Was it a fake? A quick shave? Sadly, this is a question (answer?) that even the smartest people can't answer (question?).

I was hoping for a fake beard to accompany the final clue, but it was not to be. As that same person on the forum observed, maybe Alex was just complying with Ken's photo endorsement.