I'm just suspicious that if you hear you're going to have x, y, z you will end up having x, y, z and maybe a q. FOMO isn't the fear of missing out of the side effects; it's the fear of missing out on telling people you had the side effects, and your side effects were worse than theirs. In the end, it might be as simple as wishful thinking. The worse the reaction, the better the vaccine worked.