The photo shows a tweet. The tweet, written in Turkish, describes a person (presumably the tweeter) who is 167 cm tall, wearing a brown suit and has a mustache. The tweet continues with the claim that this person, and others like them (likely referring to people who drank heavily and smoked cigarettes), aspire to change the world by studying mathematics. The humor lies in the juxtaposition of the seemingly mundane physical description (a 167 cm tall man in a brown suit) and the ambitious goal of changing the world through mathematics. It's an absurd and ironic statement, implying that these aren't the people you'd expect to revolutionize the world. The reference to drinking excessively (possibly the "2000 içen" part) and the stereotypical association of such behavior with less-than-academic aspirations is the source of the humor. The tweet plays on the stereotype of an unlikely person with seemingly impossible ambitions.