The "Blues Alright Tour" is currently in full swing and is gaining traction on social media, largely due to its official “60 and over” dance contest. In clips floating around the internet, older concertgoers take the stage and show off their best moves to Juvenile’s smash 1998 single “Back That Thang Up.” The internet has been roaring with laughter since.  We’ve sorted through videos, and here are some of the funniest ones.