As a dedicated language addict, I know the best way to learn is to speak - so I make the most of my bus rides and my strolls through downtown by listening to language drills on the iPod - mostly Pimsleur of course! On the bus, I keep it "subvocal", moving my lips and whispering the responses. On the street, I'm fully out loud.
Today I caught my reflection as I was walking through the skyway and realized I must look completely insane: headphones in, eyes focused strangely (in concentration), muttering random foreign phrases... if a person didn't know about audio language learning, they'd think I was raving mad.
I find I have a lot of room to walk on the sidewalk, and room to stretch out, even on a crowded bus.
So yes, I'm being mistaken for a crazy person on a regular basis. That's ok - it's the life I've chosen for myself. It's what a language addict DOES.
(to say nothing of explaining why I'm carrying a book that says "teach yourself Swedish" while muttering in Russian).