Selena Gomez had some form of a mini meltdown when she was on stage at KIIS FM's annual Jingle Ball in Los Angeles. She had some mic difficulties throughout her set and she was heard yelling "WHAT THE FUCK" after her performance of Come & Get It.

She then stormed off stage cutting her set short. What she didn't know is that her mic worked loud and clear for the rest of the crowd, which were mostly children. According to Us Weekly.
“Sorry, the sound isn’t working!” Gomez was heard yelled to the crowd. “Are you guys having a good night? I promise, a lot cooler people are gonna come out tonight,” Gomez continued. “Is it okay if I perform two more songs and you guys can get to it?”
But it didn’t get any better. Clearly agitated, Gomez continued to speak to the crowd hoping the issue would quickly be resolved. “I have to thank you guys so much for allowing me to be able to perform the music that I love,” Gomez said. “And I have to say that before you guys go on to the people that you care about, I really appreciate you supporting everything that I do. So this next song is the first song I had hit No. 1, and it’s called ‘Come & Get It.’”
After the song, Justin Bieber’s ex decided to leave the stage instead of finishing her set — to a crowd filled with mostly children. “She was pissed doing the next song and she said two more songs,” an eyewitness tells Us Weekly. “[She] didn’t do the last one.”