Leaving note for a guy on his car?

I'm 28, I think the guy is mid 30s. His son is in my sons class this year but we have been exchanging glances since last year. I'm not sure how to talk to him and he's on his phone a lot while waiting for dismissal clearly talking about work. I want to leave a note on his car maybe saying something like I think you're really cute and would love to talk to you. Call me sometime. From the girl you have been eyeing up or something like that.. Thoughts?
Leaving note for a guy on his car?
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