Fan theories have been around for a while but now in today's age they're everywhere. There's more than likely a person who guessed correctly and posted online that latest twist on your favorite show before it aired. After reading fan theories you won't be able to watch your show in the same way again. Here are some logical theories for your mind to obsess over.
"The one about Bojack Horseman just being a long setup to a horse walks into a bar joke. Everyone he loves will die and then in the final episode he will walk into the bar he always goes to and then the guy will ask why the long face? It will then go into the outro music which perfectly explains why he would have a long face if you listen to it" (Source).