The photo shows a sign with a Turkish phrase that reads: "ÇOCUKLARI BAHÇEYE İSETMEYİN". The phrase is meant to be "ÇOCUKLARI BAHÇEYE İSTEMEYİN" but the "İSTEMEYİN" (meaning "don't want") is misspelled as "İSETMEYİN". This creates a humorous effect because the word "İSETMEYİN" sounds like "İS ETMEYİN" (meaning "don't do it"). The joke is that the sign is meant to tell people not to bring their children into the garden, but the misspelling makes it sound like the sign is telling the children not to do it, which is obviously not the case. Therefore, the joke is based on the misspelling and the resulting humorous interpretation of the phrase.