Show off your hobbies, family or pets? Nah. The person in this meme wants everyone who visits their page to immediately know they're dealing with some who is very smart... according to this online quiz.
The whole point of this joke is twisting the expectation vs reality of the situation in an absurd way. We explained the joke, and are still not as bad of a "I'm very smart" meme as the genius who ruins fun wherever they find it.