You're at work, working on whatever the project of the day is. Your boss / coworker barges frantically in to your office with a new task / folder / project / whatever.

The world will literally light on FIRE if this doesn't get handled in the next eleven minutes. FIRE!

Since you don't want the world to, you know, LIGHT ON FIRE, your instinct is to stop what you're doing and frantically set about to handle this shiny new task.

Instead of following your instincts on this one, stop for a minute. Breathe. Think about the task. The world probably won't actually light on fire if this isn't handled right away. Finish what you're working on, then get your new stuff handled.

Chances are that everything will be just fine, even if this ultra-super-mega important task isn't completed right this minute. The person who brought you the task was probably over-reacting. He was probably too worked up about the whole thing. That doesn't mean you need to follow along.

Don't let others control your mood. Don't let others change the way you work. Relax, focus, and get things done, your way.