Hack.

Someone who thinks they are awesome at something, and the fact is they aren't.

"Hack." Andrew Lloyd Webber}
imghttp://www.newchatter.com/wp-content/uploads/2007/05/andrew-lloyd-webber.JPG/img

Hack {Michael Crawford}

imghttp://www.theatermania.com/news/images/8194a.jpg /img

{Hack} {Joel Schumacher}

imghttp://upload.moldova.org/movie/directors/joel_schumacher/thumbnails/tn2_joel_schumacher_3.jpg/img