People tend to check in during these times:
Make sure you leave your cellphones and cameras in the car, as they're not allowed inside.
Don't lean against the metal detector.
I think Milton from Office Space works at the IRS office. Excruciatingly irritating!
Go see the nurse on 7th floor. She is amazing & very nice when you feel very ill. :-)
Make friends with the security guards at the front entrance... it will make your mornings go a lot smoother.