"Bad Things" is a song by American rapper Machine Gun Kelly and Cuban-American singer Camila Cabello. The song was released on October 14, 2016 and was produced by The Futuristics. Its music video was directed by Hannah Lux Davis and premiered on December 1, 2016. The song features an interpolation of Fastball's 1999 single "Out of My Head". The single has reached a peak of number four on the US Billboard Hot 100.

"Bad Things" is a mid-tempo ballad that features an interpolation of the 1999 Fastball single "Out of My Head". Lyrically, the song incorporates themes of pain-is-pleasure type of love. The song shares a bass line with Pachelbel's Canon lending it an air of familiarity.

Gil Kaufman from Billboard called it an "instant earworm four-minute ode to dark pleasure." For Fuse TV's Bianca Gracie the song shows rapper's "softer side", and highlights Cabello's "delicate vocals". She described the song opens with Cabello "softly crooning" the hook, and MGK then comes in with a "naughty rap flow that cruises over the piano melody." In Idolator, Rachel Sonís described it as a "sleek" ballad with a "dreamy" hook.Time staff opined “Camila Cabello’s vocal hook is just fine. But if Cabello wants to make it big as a solo star, she’ll need more wattage than she finds with Machine Gun Kelly, whose milquetoast contribution takes this promising concept and deflates it.”

"Bad Things" debuted at number 80 on the US Billboard Hot 100 during the week of November 5, 2016, becoming MGK's second entry on the chart, after 2011's "Wild Boy", and his highest-charting single. It has since reached number four in the issue dated February 11, 2017, becoming both MGK and Cabello's first top five single as solo artists. In the UK, the single debuted at number 98 before falling off the chart and re-entering two weeks later at number 52. The single peaked at number 16 in the country. As of February 2017, the single has sold 596,000 copies in the United States.

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