If you don't get the shot, and you don't get the flu, it proves you don't need one

If you do get the shot, and you don't get the flu, it proves nothing

If you do get the shot, and you do get the flu, it proves you got the wrong flu

If you don't get the shot, and you do get the flu, AND survive, it proves you don't need it

If you don't get the shot, and you do get the flu, and you die, it proves you have bad luck. (or as the pro-vaxis would say: Karma is a bitch

)
If you do get the shot, and you do get the flu, and you die, it proves the shot is lethal.

Conclusion: Flu shot is unnecessary
