Guys, How will you feel if a girl slides her hand on your shoulder?

I accidentally slide my hand up a guy's shoulder when I actually wanted to tap it from behind.

He froze for a few secs, before slowly turning back to look at me with an unreadable expression. I can't tell if he likes it or dislike it.

Guys, how will you feel if a female friend slide her hand up your shoulder?

Guys, How will you feel if a girl slides her hand on your shoulder?
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