Justin Bieber has no idea what the Sistine Chapel is VIDEO

Oof, baby.

Justin Bieber was on the Late Show With David Letterman last night, promoting his new album, Believe. The 64-year-old host was at his most curmudgeonly, especially once Bieber displayed his new arm tattoo. Kids today! They release their big summer album and think that gives them the right to deface their bodies! Letterman tried to talk him out of getting another one, but Bieber said he cant promise that. Letterman persisted, asking the 18-year-old to at least promise not to make his arms look like the Sistine Chapel.

Bieber responded, Im not going for the Sixteenth Chapel look. And Lettermans day was made.

Check out the video below:

Note to Dave: I dont think we can blame this on Canadian high schools. You cant just release videos like this and then go on your way to a normal school.

Its not on the video, but later in the interview, Bieber the Canadian wisely stayed out of the American political fray, declining to endorse either presidential candidate. Too bad, both Mitt Romney and President Obama could have really used more rabid teen girl support.

Read more:Justin Biebers NBC special flops in ratingsAll Around the World: 10 Justin Bieber-isms that seem annoying but are actuallycute?This man has 15 Miley Cyrus tattoos; how many do you have?