The standard conspiracy theory is that flu vaccines give you autism and allow the government to read your thoughts. They also are a grand experiment by the Greys to colonize us by weakening our immune systems. Let me know if I left anything out, OP.
I genuinely want to know how a conspiracy theorist thinks. I can understand the though process behind believing a vaccine having side effects like autism, or adverse effect on the immune system. But the line of thought that leads one to believe that a flu vaccine can allow the government to read you thoughts is beyond my comprehension.
Actually the conspiracy theory is that vaccines are designed to lower the birth rate, and Autism is just an unintended side effect of the various heavy metals and toxins.