He made the announcement at the beginning of his monologue, speaking in a monotone voice. Musk revealed he's the first "Saturday Night Live" host with Asperger Syndrome.

However, Dan Aykroyd, a former 'SNL' cast member, also has Asperger’s and hosted the show in 2003.

Asperger Syndrome is a neurodevelopmental disorder. It manifests itself with major difficulties in engaging in social interactions and nonverbal communication. It is characterized as an autism spectrum disorder. It does not affect one's intelligence or language abilities. People with autism can experience physical and communication difficulties.

Elon was funny ... he seemed relaxed and was super self-deprecating. He joked about how he smoked a joint on Joe Rogan's podcast and now everyone thinks he's a pothead.

He also told an O.J. Simpson joke ... that O.J. too had hosted twice "and he killed it."

Elon, who's 49, brought his mom, Maye Musk, on stage for a sweet moment that was also kinda funny.