I saw this Billboard in Hamburg Central Station yesterday. I guess it's a nice idea if you think about it. Because most of the time when you are travelling you kind of feed yourself a lot of crap. Hamburgers, Snickers and that sort of stuff. So reminding travellers that there's a fast and healthy alternative seems to be a good investment (and right below that billboard is a little supermarket which actually sells fruit, too).
And for best protection of your banana get a Banabox.
BTW: I wonder why nobody has thought of a fast fruit positioning for smoothies yet. Seems pretty obvious to me :-)