What do you do if you're walking with your iPhone and it starts to rain?
QFTI hold it proudly above my head, for the mighty iphone will shield me from all of nature's inclemencies. Behold!
I would think using headphones would be worse...since the water could follow the cord right down to your phone. Also when the headphones are plugged in I'm fairly sure that's not a completely waterproof connection. So plugging headphones in could actually cause more damage than prevent it.
I would just put it in my pocket. Unless it's a torrential downpour that soaks my clothes to the skin...the phone will be safe.
What I've done before, especially when going to theme parks and whatnot, is bring along a Ziploc bag and put it in the bag when water could be an issue.
What do you do if you're walking with your iPhone and it starts to rain?
Reminds me of the hitchhikers guide to the galaxy. Rule number one DON'T PANIC!