Who sings this song, "I'm hungry, I'm losing my mind, EVERYTHING'S FINE!!!" that's like a letter?

When I was a small child I could blissfully go several days - nay, nearly a week! - without washing my hair. It was a bother to do, and I looked forward to camping because I didn't have to.

I didn't wash my hair this morning because I was in a hurry to get to work, and even thought it's only been twenty-nine hours since I last washed my scalp it's driving me nuts how filthy it must be.

WEIRD.