My son was dismissed from kindegarten because his pediatrician could not verify his vaccine record because of their hard drive crash.

I am probably on a discretionary watch list which is something I did not know existed. It involved 2 different agents questioning me and a sky marshall with canine escort on the plane. I was fine with it. I learned that those guys are so overworked they are wearing yesterday's clothes. The guy in the tired suit only said out of the blue "don't be stupid".   
If I was not with my family it may have turned out differently.
Tip:
Never tell the truth about having a headache. It may be a no fly factor. If asked how you are, you are always fine and dandy.

Speaking the whole truth is not as risky as Bruce would have you believe.