Problems with DTaP and Tdap range from mild to severe; the good news is that severe problems (seizures, coma, brain damage, nerve problems, or severe allergic reactions) occur in less than one in 1 million vaccinations.
bunk (third-person singular simple present bunks, present participle bunking, simple past and past participle bunked) To fail to attend school or work without permission; to play truant (usually as in 'to bunk off').
Headcanon. (also written as head canon, but it's really one word.). An idea, belief, or aspect of a story that is not mentioned in the media itself, but is accepted by either the media consumer themselves or the fandom in general. If it is confirmed by the creator of the story, it becomes canon.