Donald Trump‘s guest appearance gave Jimmy Fallon his highest Friday night rating in 18 months. The Tonight Show had 4.5 million viewers on Sept. 11, the largest since Feb. 28, 2014 shortly after Fallon’s debut as host. “It’s uuuuuuuuugeeee!” said Fallon after he heard the news. “He’s the best thing that ever happened to our show.”…