Nasıl Delirdim?

Nasıl Delirdim? (How Did I Go Mad?) is the fifth studio album by Turkish singer Hande Yener. It was released on 15 May 2007 by Erol Köse Production. The album contains elements of electronic, pop, house, downtempo, dance and club music, and was the singer's first studio album since the 2006 release of Apayrı. Nine of the album's songs were written and composed by Boaz Aldujeli, making him the songwriter whose name appears the most in the album. Hande Yener served as the album's producer.

Containing 15 songs in total, Nasıl Delirdim? received positive reviews from music critics and was named as one of the best Turkish albums. Recordings were done at the T-Ekspres Studio, and the song "Kibir (Yanmam Lazım)" was chosen as the album's lead single. The second and third music video were released for the songs "Romeo" and "Yalan Olmasın" respectively. All of the music videos were directed by the album's photographer Kemal Doğulu.

After six months of preparations, Nasıl Delirdim? was released with four different covers and sold 72,000 copies. It won the Best Pop Album by a Female Artist award at the İstanbul FM Golden Awards. To promote the album, Yener gave various concerts and performed the album's songs on different programs, including Beyaz Show, MTV Extra and Saba Tümer ile Bu Gece.