: Written by Rami Yacoub, Carl Falk, and Savan Kotecha, the track was originally two separate songs —one with a strong verse and another with a strong chorus—that were merged together.
: The lyrics describe an intense infatuation with someone who possesses an indefinable "one thing" that makes the narrator feel weak and nervous. One Direction - One Thing (Audio)
: The song famously uses the term " kryptonite " to describe the subject's effect on the narrator. : Written by Rami Yacoub, Carl Falk, and
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