Calibre:
I have heard this thought before... all I can say is quite a number of years ago both the wife and I got our one and only flu shot... within one hour we were both severly sick with flu like systoms. I never get any flu's but that year I did !
Considering most if not all flu virus usually takes 48-72 hours from time of exposure before someone would have any symptoms, it is likely you had some form of allergic reaction (or psychosomatic) rather than 'getting the flu'. I am not discounting your experience but it is not scientifically sound that you got 'the flu' from the flu shot.
In order to get sick from a bacteria or virus, there has to be enough of the bug inside of you to overwhelm your immune system so it goes into full attack mode. This and a weak immune system (often caused by lack of sleep, poor diet, stress) are usually the components required to be sick. Thus even if the vaccine contained a live virus, it would take at least two to three days for it to reproduce in sufficient quantity to make someone ill.
Allergic reactions require an existing sensitivity such as to eggs (contained in most vaccines) so that upon even limited exposure the body's immune system goes into overload/high gear.
There are plenty of well researched web sites that can do a better job explaining the science behind the above statements. I encourage everyone to do their own research from reputable sources (aka not Jim Carrey & Oprah).
Uzzah