[Ah, it feels like he should be irritated from this. Not quite to the point where he really would be noticeably annoyed, but there's the inkling. It was enough to make the otherwise dull/slow seeming 'bartender' to have a rather icy tone to his voice.]

So you just make it a habit of grabbing strangers' shoulders? Did you know that there was a .0045% chance of scaring someone to death by grabbing them from behind?