During the vice-presidential debate on Tuesday, one of the most intriguing sub-plots was the running commentary kept up by Donald Trump through his tweets and retweets.
At the height of the debate, Trump chose to retweet one message likening Democrat Tim Kaine to 'an evil crook from the Batman movies.'
Yet, despite the howls of derision and condemnation, perhaps we shouldn't be too surprised. After all, it's not as if the Donald is any stranger to tweeting the things which are well, how do we put this, a little edgy.
Check out the gallery below to see the billoinaire's most controversial tweets and RTs.