Rapper Kanye West has admitted that his headline performance at Glastonbury in 2015 put him in a "depressed state" that reminded him of being sacked.
West said it was a humbling experience when he forgot his lyrics and got the music wrong.
He told BBC Radio One's Annie Mac: "It was incredible. I started off the show and I completely messed up the music. And me, as you can imagine by this phone call, I'm a bit of a perfectionist.
"So it really put me into a slightly depressed state, and it put me back in the position of when I was in high school and I got fired from my job, or when I played my music for R Kelly and he told me he was going to sign me, and then three months later I didn't have any money, I couldn't afford a haircut, I couldn't take my girlfriend to the movies and I'm still in my momma's bedroom, working on beats, and I was that close to being signed by R Kelly.
"I don't usually get nervous, I prepare, I get fully prepared. When that music messed up in the beginning, it tapped into my nerves and when you're nervous or vulnerable, something special and something different can happen."
West also outlined why he wants to run for US president, an ambition he announced on stage at the MTV Video Music Awards last year. He said: "We are numb, we're numb to 500 kids getting killed in Chicago a year.
"We're numb to the fact that it was seven police shootings in the beginning of July ... we're numb to places on the earth that we don't live - like our life is okay but it's okay for other people's lives to not be okay.
"When I talk about the idea of being president, I'm not saying I have any political views, I don't have views on politics, I just have a view on humanity, on people, on the truth.
"If there is anything that I can do with my time and my day, to somehow make a difference while I'm alive, I'm going to try to do it."
His other goal is slightly more practical - he wants to collaborate with Ikea. He told the show: "I have to work with Ikea - make furniture for interior design, for architecture, and I know that if I do a minimalist apartment inside of a college dorm where the TV goes on the side of the wall...
"Yo Ikea, allow Kanye to create, allow him to make this thing because, you know what, I want a bed that he makes, I want a chair that he makes - I want more products from Ye."
Hear the full interview on Annie Mac's show on BBC Radio One on Monday 7pm-9pm.