Third party interruptions are the bane of a good, tense roleplaying session. When you're in the middle of a combat sequence or a gritty dungeon crawl, the last thing you want is a parent or room-mate or girlfriend barging in and demanding that you take the garbage out or clean the fridge or explain what you were doing with your ex in the local coffee shop yesterday.
Seriously, don't these people know there are more important things going on?
GM: Padmé collapses in the desert and dies of heat exposure and dehydration.
Padmé: Annie.... <gasp>
GM: Giant sand birds slowly circle down towards her still form.
The Kid: Hold it. Hold it, grandpa...
The Kid: You read that wrong. She doesn't run through the desert. The clone trooper calls in a ship to pick them up. I'm just sure of it.
The Kid: If she dies running through the desert it wouldn't be fair.
Grandfather: Well, who says life is fair? Where is that written? Life isn't always fair.
The Kid: I'm telling you you're messing up the story, now get it right!
Grandfather: Do you want me to go on with this?
The Kid: Yes.
Grandfather: All right, then. No more interruptions.
Clone Trooper: My lady! I thought I'd lost you. You looked like you were hallucinating. Here, take my water flask.
The Kid: See? Didn't I tell you she'd never die in the desert?
Grandfather: Yes, you're very smart. Shut up.