The photo is a tweet. The tweet, written in Turkish, expresses the speaker's surprise and frustration at the cost of a hot air balloon tour over Cappadocia. The joke lies in the implied contrast between the speaker's expectation and the reality of the situation. The speaker expected the cost of the Cappadocia hot air balloon tour to be something reasonably affordable, and likely in line with their local currency (euro). But, when they learned the actual price, they were shocked and felt that it was extremely expensive. The speaker's parent's potential reaction, suggesting that they would be disappointed and possibly angry at the cost, is the punchline. The final phrase "beni deli diye kömürlüğe zincirler" (They would chain me up in the coal cellar because I'm crazy) is a humorous exaggeration of the disappointment and is a common expression in Turkish. This implies the parents would be so upset they'd treat the speaker poorly. In short, the humor comes from the speaker's over-the-top reaction to a significant financial expenditure.