Ali Abdülselam Yılmaz (born 1993), better known as Fester Abdü, is a Turkish YouTuber and the owner of Deli Mi Ne?

[4] In 2018, Yilmaz's participation in a running race with pink high heels and diving on the shipwreck named Majestik, which had sunk in the Battle of Çanakkale, caused reactions from various media organizations.

[5][6] In July 2019, Yılmaz filed a lawsuit against Show TV for using his channel's videos without permission and publishing defamatory broadcasts.

[7] In August 2019, Yılmaz jumped onto the field at the 2019 UEFA Super Cup, played at Vodafone Park between two English clubs Liverpool and Chelsea.

As a result of these events and subsequent criticism by YouTubers such as Enes Batur as well as media outlets, the number of subscribers on his channel started to decrease.