Years ago, I joined a company making games for handheld consoles.

Because a game's audio needs to be tested, too, I connected earphones to the console so that:
0. I wouldn't bother others w/ the sounds coming out of the console.
/* !Everyone wants to hear that crap. */
1. I could hear the sounds better.

PM: * Enters the room. *
Me: * Focused on testing the game. *
PM: * Walks up to me from the side, starts talking. *
Me: * Focused on testing the game. *
PM: * After approx. 30 seconds of complete lack of response from me, kind of irritated, knocks on my desk to get my attention. *
Me: * Take out the earphones. *
Oh, hi, how can I help you?
PM: Haven't you heard a word I said?
Me: Well, no. I am testing the game, including the audio.
PM: You need to pay attention to what's going on around you.
Me: Testing audio is one of my responsibilities. I am using earphones because of the reasons [0-1].
PM: Even still, you just need to pay attention to what's going on around you.
PM: * Finally explains the reason for him bothering me, then goes back to his lair. *

Moral of the story: Fuck being good at what you do && knowing your responsibilities.
When PM wants something from you, you better give him the attention he wants.

/* The expectation being I grow an extra pair of eyes && ears, so that I see the guy coming && am prepared to listen to him whenever he wants something _while_ doing the best job I possibly can. */