Why do people who see you are very concentrated and in the middle of something make a point of trying to interrupt you

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With some kind of mundane bullshit the next time someone does I'm going to start some fucking shit with them

[Plug Drugs]

My friend Steve used to do it all the time if I was doing a hard math problem which takes total fucking silence to do otherwise you have to start all over with remembering where you were don't know why I brought this up I just needed to vent that because it happens over and over and fucking over