"Many of Horror" is an alternative rock song by Scottish band Biffy Clyro for their fifth studio album Only Revolutions.

Matt Cardle, winner of the 2010 series of The X Factor, recorded a studio version of the song under the title "When We Collide" and released it as his debut single, after having performed it in the final of the competition.

The song is featured on the deluxe edition soundtrack to the film Transformers: Dark of the Moon and is played during the end credits.

[5] Tim Newbound of Rock Sound described it as "beautifully serene" and stated it balances out more aggressive songs on the album.

[7] Thom Gibbs of Drowned in Sound was critical of the song, calling it a "so-so ballad" and describing it as "too emo".

Nick Levine of Digital Spy praised Cardle's vocals, stating he delivered "the violence-tinged lyrics with an appealing sense of intimacy, navigating the inevitable key change with ease and really smashing it on the final note".

"[19] Unrealityshout.com agreed, stating "I actually find it very hard to listen to such a heroically valiant vocal from the Biffy Clyro clan get turned into a whimpering, reedy, falsetto-ridden snoozefest".

[28] In June 2012, It became the 123rd single to sell a million copies in the UK, and the fourth by an X Factor contestant, after Shayne Ward's "That's My Goal", Leona Lewis's "Bleeding Love" and Alexandra Burke's "Hallelujah".