Monday night's episode of Raw saw one of those infamous guest 'stars' make an appearance. Rapper Wiz Khalifa showed up to perform one of his tracks that appears on WWE 2K15. Vince McMahon and his creative teams really do struggle to fill three hours with compelling television sometimes. It's safe to say that McMahon would have been left rueing the day he agreed to let the controversial star on his PG programme. Wiz tweeted the picture above with the caption: "Thanks WWE for showin the pothead some love." Pothead? Really getting over with your demographic there, Vinnie. Sometimes there is room for a bonafide guest star to appear on Raw or on a PPV. In recent years we have seen some truly great entertainers add something to the schedule that the performers on the WWE's roster at the time simply couldn't. However, for everyone one of those we have been left either cringing, bored or reaching for the remote when a nobody or someone we just can't stand is making a mockery of the wrestling business. It is these men and women that make this countdown. There is little doubt that the powers that be at WWE would rather you forget they were ever on WWE TV, but we're here to out those disastrous of decisions.