Luckily they were able to recover for the rest of their performance of Moth Into The Flame, although it definitely wasn't our fave.
Lady Gaga is known for her exciting (and often artistically bizarre) performances, so when she's set to sing at an award show, fans know there will likely be something special in store.
Ch-ch-check out their performance (above)!
One week earlier, the career-spanning medley that was the Lady Gaga Super Bowl halftime show was widely praised as a success.
Something tells us Metallica won't be itching to perform at the GRAMMYs anytime soon.
The pop star ended the performance by diving into the crowd.
Fresh off their, well, perplexing appearance with Lady Gaga at the Grammys, Metallica announced they're hitting the road this summer and performing at stadiums across North America.
"I saw them recently and we were watching the show", she added, "those guys play better than they've played in their whole lives".
His band was overlooked in the introduction to its performance with Lady Gaga, and his microphone was not turned on. "I was at Bradley's house with [Metallica drummer] Lars [Ulrich] and we were just hanging out", she told Apple Music Beats 1 host Zane Lowe on February 8.
Carino and Gaga were first spotted together last month at a Kings of Leon concert and were then seen "cuddling" on the Super Bowl LI field over the weekend, according to People.
The band has been nominated for Best Rock Song for Hardwired from their latest album Hardwired.To Self Destruct. I was greatly disappointed when they cut their hair in the mid-1990s and became even more polished and accessible with Load and Reload.