Not Funny Meme

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My guess is they saw the 67 meme. The meme wasn't funny to begin with

They saw Sticks trying to use a cellphone

Kenzie looks very disappointed or worried, so maybe she saw her horse boyfriend comedically get into an accident of some sort, like falling over and bumping his head against something, or knocking over a bunch of piled up things, and Linzy had the innate reaction to laugh at his fumble.

I imagine that's the reaction to the Rouge butt heart