Since coming up with theories as to why the lady went all Bullitt in her Infiniti in the nation's capital yesterday seems to be the trending thing, I'll throw my theory into the ring:
She probably went to healthcare.gov and when, after all the 404 errors from the world's first government-and-media coordinated DDOS attack, the page finally loaded, found out she was still expected to, you
know, buy insurance.
I always get a little bent when people
promise me free stuff and then tell me "Just kidding! You have to pay for it!", too, so I
can understand the reaction.
EDIT: The Today show in the next room is saying that she may have believed the president was stalking her. If everybody who believed the president was stalking them reacted like that, the South Lawn of the White House would look like Dead End Drive-In.