I'd tip the owner if he's doing your hair -- he's free to decline to accept if it offends him.
I always start at 20% with salon tips -- I'd probably give him 25-30%, and I think offering to buy dinner is an awesome idea.
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A hiney bird is a bird that flies in perfectly executed, concentric circles until it eventually flies up its own behind and poof! disappears forever....
-Ken Harrelson
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