Why did a guy friend of mine shook my hand vigorously. my boobs started to shake little. I felt embarrased. did he do it on purpose?

this guy is not close friend. but he always offers me handshake. when he shook my hand fast, he was staring at my chest while doing so. did he do it on purpose or not?

Why did a guy friend of mine shook my hand vigorously. my boobs started to shake little. I felt embarrased. did he do it on purpose?
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