The photo is a tweet. Görkem Yaz, a person on Twitter, is describing a situation where they fell asleep on a journey from Istanbul to Ankara and woke up on the journey back to Istanbul. The joke is in the last two lines: "Lan belki öldüm niye uyandırmadınız diye bağırıyor asdfghhjjjjj" This translates to: "Oh my god, I might be dead, why didn't you wake me up? (screaming)" The humor comes from the implied exaggeration. Someone who just woke up from a long nap, likely upset and disoriented, is reacting in a dramatic, almost hyperbolic way. The random letters at the end (asdfghhjjjjj) adds to the humorous, slightly frantic, and absurd tone. It's a common form of internet humor in Turkish. The overall gist is that the speaker is upset and joking about a rather mundane, albeit amusing, experience.