Every one of these misconceptions comes from hearing actual jokes and taking away the wrong lesson. In this case, the humor in a lot of jokes comes from an unexpected twist or an incongruity or a mismatch. Like the most depraved sequence of sex acts imaginable being titled "The Aristocrats."
Having brought up "The Aristocrats," which sort of sucks, I should note that a lot of the "good joke" examples I list might not be funny to you, or even me, but the reason I put them in the "good joke" category is that you can at least see a reason why it is supposed to be funny instead of having no idea how it could be a joke. Like if aliens kidnapped you and threatened to kill you unless you explained why the joke was supposed to be funny, you would be able to come up with something for them, even if you disagree with it. As opposed to going "Oh God please don't kill me I swear I don't know."
Which is what would happen if you had to explain "RAWR moo zombie dinosaur mustache Lady Gaga I'm craaaazzzy! I like turtles!" I probably should put "randomness" in quotes, because it's hardly ever truly random. Most of the words consist of quotes from memes ("tiger blood," Chuck Norris, "over 9,000," "ceiling cat"), current names in pop culture (Justin Bieber, Ke$ha, a Kardashian), and this weird little list of words that almost everyone seems to pull from when trying to be random ("monkey" or "chicken").
I don't know why primates are the most popular go-to animal for instant humor. I mean, they seem quite dignified to me.