The photo shows a Twitter thread. The initial tweet asks, "What would you like written on your tombstone?" A reply from another user (@mckzlkk) offers a rather morbid answer, "Let it say 'He died for the first time for himself after dying many times for others.'" The joke lies in the ironic, almost macabre, wish for the other user to die soon. It's a dark humor, playing on the idea of a cynical but realistic (or perhaps just pessimistic) view of human life. The sarcastic response implies that the person in question is considered a nuisance or burden to those around them. In short, the humor comes from the juxtaposition of the relatively benign question about a tombstone inscription with the deeply cynical and possibly callous response.
Öyle bir şey söylemişsin ki, şuan mezar taşına "çok üzgünüm abi" yazdırmak istiyorum 😂