I'll never get a flu shot. A fellow I worked with got one in October 2009. He ended up with Guillain-Barre Syndrome and has just within the last month been able to begin to walk again, more than a year later. Although Guillain-Barre is a rare side effect from the flu vaccine (rate of 1 per million), I will not take that risk. Check out Guillain-Bare on Wikipedia if curious.