If a coworker seems to have a problem, don't let it get you upset -- you won't be privy to the problem for a few days yet. In the meantime, you're a machine when it comes to getting the job done -- any job -- and you'll get it done well. Since you've probably been playing for the past few days, this diligent mood will be just what the doctor ordered -- if you want to keep your job, that is, and of course you do.