It might be friendly fire, but it will still sting when problems with coworkers erupt into craziness on monday. You might feel better hiding in your cube, but eventually you'll have to come out and face it. Money issues crop up midweek, and everyone around you will need to pitch in to make them right again. By friday, you'll be back on top of the game and ready to think big about the future: yours and your industry's. If there's work to be done sunday, get it over with quickly. You'll be prone to frustration, but your mind will be sharp.