We all know that slowed-down Justin Bieber produces Sigur Ros (though the reverse is not true). But what happens when Mary-Kate and Ashley Olsen hit the purple drank before a pizza party song? This. Video Link.
An excerpt from this, in which the celebrity twins also clearly slowed their roll.
All of this comes from You're Invited To Mary-Kate and Ashley's Sleepover Party.
And here is the original version of the Pizza Song.