"Us fat people only dance in our heads," Jason Goliath says. But can Goliath, the local ballroom jester, show South Africa that his samba should not be exiled back to his mind?The comedian will face his toughest challenge tonight on Strictly Come Dancing, when he and several other celebrities take to the floor.Speaking to a sweaty Goliath after he rehearsed a series of body rolls and twerking moves that would put Miley Cyrus to shame, he still had time for one-liners."This body was designed for the bedroom and not for ballroom. I have always refused to do group dances. I had three basic moves, so that I looked acceptable in the club," he said.Goliath is not the first heavy-set contestant.In the third season, Hip Hop Pantsula went on to win the show.But Goliath is realistic about his prospects for winning."In every performance HHP does what he does to music, I do not do comedy to music. I stand still already. I refuse to be compared to HHP, let him come and make a joke and then we can talk."Goliath got the lowest score from the judges last week but is still in the competition, thanks to the audience votes. Television presenter Leigh-Anne Williams scored the highest.Goliath said: "I have an opportunity to let South Africa see that I'm funny - and I can twerk."Williams said: "I'm not the funniest girl, but when [my partner] and I are up there we're going to give you good dancing."..