Genuinely believes he's a genius, which would be annoying if the first five albums didn't basically prove him right.
Fun fact: Every major label rejected him as a rapper, only wanting him as a behind-the-scenes producer.
Dave Grohl was Nirvana's drummer and apparently thought right, I'll just front my own massive band then.
Fun fact: Dave Grohl recorded every instrument on the band's debut album entirely by himself.