Elon Musk took the witness stand for a second day on Monday in a trial over a controversial tweet from 2018, in which he claimed he had "funding secured" to take Tesla private for $420 a share. Musk is attempting to explain the thought process behind the tweet and push back at the idea that it was partly a joke. U.S. Judge Edward Chen has already ruled the tweet was false and reckless, and Musk is now trying to convince the jury that he did not know the tweet was false when he sent it.