Ever been to a concert with someone who just refuses to groove to the music? They just sit there, without nary an affect. Then when you grab their hand and try to dance with them, or try to garner some kind of emotion, and they are a voided blank stare. No drugs, I'm not talking about eating a brownie and drinking some tea....
What drives me nuts, is meeting someone, getting on with them, asking them to a show, and then seeing that they are not even minutely effected by the music that you LOVE! In my youth, I went to many, many shows, and I broke up with quite a few girlfriends at shows. Maybe, I am thin-skinned, but it always just floored me, when this great girl, that I thought I understood, just sat there like a block of wood. Some people do not ALLOW music to free their spirit, and those people drive me nuts.