Total. boy. humour. And it's hilarious. Really silly and did I mention the boy humour? There's a lot of it.
At a guess I'd bet that maybe 60% of the information in each section covering each president (except those that are still alive - is that for legal reasons, do you think?) is probably factual. 20% is blatantly called out by the author himself as just wishful thinking, and the other 20% could go either way.
But I hope nobody thinks they're picking this up in order to expand their factual knowledge of presidential history. There's a lot of good stuff I didn't know before, but the focus is very narrow and aimed solely at making the presidents all look like bad asses. How to Fight Presidents is a fun, entertaining, wishful thinking sort of book that will accidentally import some small inconsequential facts into the reader's brainpan when they aren't paying attention; guaranteed to make them only slightly quirky at the next cocktail party, or the dark horse at their next trivia night. Or maybe just slightly better prepared should he or she accidentally find themselves in a dark alley with a sitting president-pretender. You never know I guess.
Book themes for Festivus: Read anything comedic; a parody, satire, etc. Books with hilariously dysfunctional families (must be funny dysfunctional, not tragic dysfunctional). Anything that makes you laugh (or hope it does).