Never hang out with an audio mixer. They point out some many noises in day-to-day life that I have just tuned out or never even noticed. Once they point it out though, I can't not hear it. To be fair, I'm that way about video and compression pointing out to people how shitting cable quality is. I'm a TV sales rep's worst nightmare.
There was one movie I was watching and I noticed the sound of a (propeller) plane flying overhead. I wouldn't normally have noticed this, except I was wearing headphones. I couldn't help but wonder if they noticed. and if so - did someone said - "screw this, we're not reshooting the scene."