In movie scenes in a restaurant, what do the extras pretend to talk about?

I was an extra in “Jurassic World” — not in a restaurant but in the legal office. It’s the back of my head and I think I’m in it for two seconds, but it took a whole day to film. As others have said, you have to move your mouth and make no noise. I wanted something that would look like I was making conversation, and something that would give me the opportunity to occasionally nod or shake my head no.

So I silently mouthed the words to “Baby Got Back.” Intro included.

Next time you watch “Jurassic World,” if you catch my split-second appearance, know that I’m pretending to say, “So Cosmo says you’re fat/well, I ain’t down with that”.

Edited to add:

For those who have wondered, I’m the shadow over Judy Greer’s right shoulder in this still image from the scene.

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