Sad clown lyrics panic at the disco

You're thinking of the song "Sad Clown" by Panic! At The Disco!

Here are the lyrics for you:

"I'm a sad clown, I'm a sad clown I'm a sad clown, I'm a sad clown I'm a sad clown, I'm a sad clown I'm a sad clown, I'm a sad clown"

(From the album "A Fever You Can't Sweat Out", released in 2005)

These lyrics are quite iconic and have become a fan favorite!