Star Trek: The Next Generation - Picard's Nice Face Break
At the beginning of the episode (before the title screen rolls up), Picard and Riker are walking to exit the bridge to meet the Admiral in the transporter room. As they start to walk off the scene Picard makes an usual facial gesture that cracks me up every time. It looks like he's saying hi to a friend that's off stage. I think he's smiling or even mouthing a word like "hi!" Probably to somebody off the set. Check it out if you can.
A good eye, Star Trek TNG DVD Season 1: episode 116, "Too Short a Season"