I play harmonica... only wind based instrument I play. Frustrating, though... all the different keys you have to get them in
i keep mine in the truck so i just annoy myself and no one else hears it i usually just find it to play along if neil young song comes on the radio
Mine is in my vehicle too. I suffer from tinnitus though so not really interested bursting my ear drums with it in the cabin. The good thing with a harmonica is that no matter what you really do, it's easy to get some sort of tune going on. As usual, I tend to make a lot of noise but not much sense.
Got several in the car (- according to 'Don't leave the house without a musical instrument'). It's perfect to exercise / fool with while driving.