We've all seen the numerous covers of Pharrell's hit song Happy but here's one with a difference.

It comes from renowned musical-parodist Weird Al Yankovic who became famous for his version of Michael Jackson's Bad. Al's version was called 'Fat'.

Rather than just mime along to the original lyrics, Weird Al writes his own and usually comes up with something pretty amusing.

Al's version also stars Jack Black and Modern Family’s Eric Stonestreet.