What’s your favorite way to get someone to stop flirting besides making up a imaginary girlfriend/boyfriend?

Assuming that they haven’t done anything too overt and you don’t want to make things too awkward. My personal favorite is “you remind me a lot of my sister, mom, or other close family member” they tend to stop really fast if they are flirting.

What’s your favorite way to get someone to stop flirting besides making up a imaginary girlfriend/boyfriend?
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