Andy Cohen -- My Favorite Part of the Olympics ... BOB COSTAS' EYE!!!

Here's something you've probably never seen before ... ANDY COHEN ON A SPORTS WEBSITE!!!

Mazel!

Anyway, the Bravo icon was out in NYC last night when we started talking Olympics. Even though Andy admitted he doesn't fancy himself much of a fan, he says there's one event in Sochi he can't stop watching -- THE BOB COSTAS PINK EYE SAGA!!!

It doesn't stop there ... Andy also explains why he's rooting HARD against Mother Russia.

Check out the clip ... GO USA!!!