**Rant Warning**
I get a lot of different reactions to carrying a guitar everywhere. Some people go totally crazy for it, some think it's an every day thing. Most just look a little brightly and don't say a word. There's only one type that really bothers me. It's The Guy Who Recommends You Music.
A standard thing for The Guy Who Recommends You Music to say is "Hey you have a guitar! You'd love this obscure piece of crap music because I girl I liked years ago said she liked it once and I've listened to it a million times since." (They don't punctuate.) This is usually followed by them fumbling with phones, mp3 players, and websites, trying to communicate to you the brilliance and emotional weight of the life changing experience that is this music. Usually it's just one guy with a poorly mic'd guitar whining clichéd lyrics in a post Elliott Smith lament over a lost love.
Don't get me wrong, I have my own strange music I listen to, and I like a bit of Elliott Smith now and again, but I don't stop strangers on the street and make them listen to it. The main problem is that The Guy Who Recommends You Music is usually enthusiastic and clueless, so you can't be outright rude to him; it's a social trap of politeness.
One day someone will recommend me a band and I'll punch them without a word of warning.
Just you wait.
References:
http://www.imdb.com/title/tt0137523/quotes?qt=qt0479121
http://xkcd.com/920/
