"What a Catch, Donnie" is Fall Out Boy's second digital download single and third radio single from their fourth studio album Folie à Deux (2008). It was first released as part of the buildup to the new album on iTunes on October 14, 2008 and charted on the US and Canadian singles charts. The track features numerous musicians performing cameo appearances in the song, singing lines from past Fall Out Boy songs. Bassist/lyricist Pete Wentz has said that he wrote the song to remind himself of vocalist/guitarist Patrick Stump. Musically it is one of the band's very few ballads. Fall Out Boy played the song live on Late Night with Jimmy Fallon.