Oh, I forgot - there is a good argument that a low pass is not legal. That whole minimum altitude over "a congested area but “not for the purpose of takeoff or landing.” Take a look at 91.119, make your call eyes wide open. Sorry to take all the fun out of it. I know - there's many rationalizations, justifications and arguments. Not trying to pick a fight - just pointing out some issues with the practice of this maneuver.

Tom