How can you politely tell someone to stop showing and sending you videos that aren’t funny?

I love my coworker, but she constantly shows people Tik Tok (can’t stand the app) or “humorous” videos that aren’t funny. I can be at my desk and she puts her phone in front of me, grinning at me waiting for me to laugh. Or she’ll quote things and I really don’t get the humor behind it. I haven’t seen one person genuinely laugh at her videos or quotes. I didn’t mind at first, but it’s happening every time I work with her.
How can you politely tell someone to stop showing and sending you videos that aren’t funny?
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