Justin Timberlake and Jimmy Fallon performed 'Bring It On Down to Wrappingville' on 'Saturday Night Live' and Twitter went crazy. As John Basedow (@JohnBasedow) reports, the 'Mirrors' singer and late night host were dressed as a roll of wrapping paper and a gift bag as they rapped about fulfilling all of your holiday packaging needs. This SNL sketch might just become the next holiday classic.