Sufjan Stevens must have spent the weekend listening to Katy Perry's new album Witness, because he seemed to really be moved by some of her lyrics. On one of the album cuts 'Déjà Vu', Katy sings "Your words are like Chinese water torture." Stevens had a strong reaction.

"LORD HAVE MERCY," he posted in a brand new Tumblr post. He then went on to compare her lyrics to his on his 2005 song 'Casimir Pulaski Day.' "And y’all thought it was weird when I wrote, 'Tuesday night at the Bible study." The title of the post was 'ALL RESPECT ALL CAPS.'

Read his full rant here.