Colleague sends an email. Ignore it cause I'm focused.

Same colleague sends a chat request. Ignore it cause I'm focused.

Same colleague sends a text message. Ignore it cause I'm focused.

Same colleague actually calls. Ignore it cause I'm focused.

Same colleague walks over to tell you about the email and the chat and the text and the call. But when he gets to your desk, he realizes that he figured out the solution, so breaks your focus to apologize for breaking your focus.

Ass.