Even if I'm not hanging around for the entire show, I'm always sure to catch Jimmy's monologue each and every weeknight. In fact, I watch the monologue so intently that I started to notice a tremendously odd thing about the way Jimmy delivers his jokes. In addition to the classic "set up, punchline, cue laughter" method that has been around since jokes were invented, Fallon adds this bizarre string of gibberish that makes him sound like he's speaking in tongues. I threw together a quick video to demonstrate what I mean.
I'm not crazy, that's weird, right? And the weirder thing is that no one talks about it. Whenever I hear that someone watches The Tonight Show, I always ask them if they notice the gibberish, and they look at me as if I'm the f****n' weirdo in this scenario. My prevailing theory as to why this happens is that Fallon is attempting to do a "trail-off" of sorts before the audience starts applauding. But where most comedians will end with an "ummm" or maybe an "AM I RIGHT, FOLKS?" Jimmy just lets his mouth do whatever it wants. And if the noises that come out don't happen to be words, well, then so be it.
It's either that or his cue-card guy has a nightly stroke while writing his lines down.