If there are literally any other voices or sounds at or near the same volume that you're speaking to me, I ain't gonna be able to focus on you. Especially if what you're saying is boring.
Oh yeah. Another one is if I'm driving and you're talking to me, we will miss our turn or I will completely miss what you said. It happened last night to me. I was taking a friend to the train station, and she was talking a lot. I missed the station. We had to do a 5-mins turn-around in silence until we got there. This might be an autism trait tho.
I once ran a stop because I had 3 people trying to talk to me while I was driving around an area I was unfamiliar with. And then I spent the rest of the drive being yelled at by those 3 people for running the stop sign.
My fiance does this when I'm watching TV and used to get a little offended that I would pause the TV. Then I explained to them that I can't focus when you're speaking, so I pause the TV to listen to you and give you my attention. I guess he thought I was annoyed he was interrupting when I would pause it, that is not the case at all. What he says is more important than anything on the telly