This has happened more than once, but not often. My phone rings, and I hear bustling, things moving around, background conversation, etc. Nobody answers my "hellos" or whistles.

Right now I've got the speakerphone on, listening to someone industriously working at a Jamba Juice somewhere. The sounds of the mixer are identifiable, and twice someone has mentioned their flavors. It's not a customer, the mixer noises are too loud and it's gone on too long. I know nobody who works at a Jamba Juice.

Someone's "autodial" or something has called me from a phone in a pocket, and they're broadcasting their life. It could have been worse.

I assume sooner or later they'll want to make a call, and figure it out. If I hang up, the thing calls me back.

I like cell phones that close up when I'm not using them so things in my pocket do not generate bad commands. My most annoying external button on my GzOne is one that will shut off ALL sounds and vibration, essentially turning my phone off to callers.