I'm guessing about 10% max use their own headset on the 717. So I leave the ship headset plugged in when I leave. But I don't ***** when I have to dig around to find one.

I don't worry about germs. Widespread exposure is nature's inoculation protocol. (Let the kids play in the dirt.) I worry about alien abduction. Lining the inside of my hat with tinfoil seems to work - and I always wear my hat.