The photo is a social media post, likely on Facebook, from a user named Barış Sezer. It quotes another user, Can Yücel, who said: "People deal with what's in their minds during the day, and with what's in their hearts during the night." The joke, or at least the humorous implication, comes from the subsequent comment by Hikmet Sezer. He's reacting to the quote in a way that suggests he's not entirely serious. His comment, "opened a shop, are you kidding me?" is a sarcastic remark implying that the original quote about day/night concerns is irrelevant or trivial compared to the effort of opening and running a business. In simpler terms, the humor is in the contrast between the philosophical observation of Can Yücel (day/mind vs. night/heart) and the practical, potentially struggle-filled reality of opening a business as reflected in Hikmet Sezer's comment. It's a lighthearted jab at the complexities of both daily life and running a business.