I apologize for the exact episode but I was watching
SNG the first season, I think it's the second or third episode.
Ruler and Picard are rushing off the bridge and entering the
turbolift and Picard all of a sudden just as he steps into the
turbolift, watch him from the side it's hilarious.
He clearly crosses his eyes and opens up his mouth really wide. He is definitely goofing someone on the crew you can even see him smile after he does it.
It really took me by surprise because I have every episode on DVD and I never saw it before and I've seen that episode
at least 20 times. Enjoy!!!