It happens all the time. The crew is rolling on a scene outside and pedestrians are abound. One of them approaches another guy that is watching the the scene unfold and asks, "What are y'all shooting?" It's only half-way into this conversation to himself does the passer-by realize that the sound mixer can't hear him because he's actually listening to something else! I've always got annoyed by these people and, like many others, threw some white gaff tape on my headphones that read "I Can't Hear You." Apparently they didn't even get that message all the time, so I got some of these stickers made that should get the "it's not you, it's me" message across. I made them for my Sony MDR-7506 headphones. They have the perfect real estate for them and make for a perfect fit. I have a ton of extras for anyone else interested in a pair. They're available on my Inaudible Labs website here and are $4 + s/h ($1 in USA and $4 abroad) and come in pairs (two stickers per order). People may not stop trying to talk to you, but at least they won't talk to themselves anymore.