Do you have a fluster button?

Meaning, is there something you do to the opposite gender while flirting that makes them blush/get flustered?

For example. I recently went to a formal event with a guy friend. We're just friends, but we flirt with each other for fun. So sometime while we were standing around, he smoothly walked up to me, adjusted his tie, shot me a look with his charming face, and said "hey." in a low voice (if you can picture that). He was trying to fluster me and it totally worked; every time he did that, I involuntarily giggled.

So I told him I wanted to find a female alternative for that. So I tested different flirting moves throughout the day with little luck. But I found my fluster button on accident actually... he was yawning and I just took my finger, put it under his chin, and tried to close his mouth. Suddenly, he told me that worked for him, so I did it again while giving him a flirty smile. And he said I found my button! :D

So I'm curious if anyone else has found these buttons!
Do you have a fluster button?
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