"Bad" (also stylised as BAD!) is a song by French house music producer and disc jockey (DJ) David Guetta and Dutch production duo Showtek, featuring vocals from Australian singer Vassy. It was released on 17 March 2014 as the second single from Guetta's studio album, Listen. It was written and produced by Guetta, Showtek, Sultan & Ned Shepard, and Manuel Reuter and it was co-written by Giorgio Tuinfort, Ossama Al Sarraf, Vassy, and Nick Turpin. The song entered and peaked on the UK Singles Chart at number 22. This track has since topped the chart in Finland and Norway. The song, which features vocals from Vassy, features her with an Auto-Tuned voice; reviews were critical of the effects applied to the vocals.

The music video is on both David Guetta's YouTube and VEVO account. It is a total of 2 minutes and 50 seconds long. It was released on April 10, 2014.

It starts out with a girl fighting zombies while the zombies dance as a reference to Michael Jackson's "Thriller". Suddenly, she falls in love with one of the zombies who goes up to her, and the two run away from the military, who are chasing them.

Mike Wass of Idolator wrote: "The grittier electro-house sound of 'Bad' is perhaps an indication that the hitmaker is moving away from the commercial dance sound of his last LP. Former hardstyle duo Showtek ensure that the beats come thicker and faster than ever, while Australian dance diva Vassy provides the instantly catchy hook — albeit in a heavily autotuned voice."

^*sales figures based on certification alone
^{^}shipments figures based on certification alone
sales+streaming figures based on certification alone

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