"Diary of a Mad Man"
Yeah, so this character is legit crazy, and the story traces his descent into madness via diary entries. By the end of the story, instead of a normal date, we get things like "Madrid, 30th Februarius." At first things felt very Alice in Wonderland to me, with the protagonist spotting two dogs talking and making a plan to find out what's going on. Aaaand before you know it, he thinks he's the next king of Spain. It's funny but also sad, especially since he ends up in an asylum. What's made him go mad? Is it his life of drudgery as a titular counsellor? Society in general? Or, he's just simply crazy.