Jonah Hill turned up as the surprise guest at SiriusXM ’s Smartless LIVE on Saturday night at Hollywood’s Palladium for an appearance that marked his first lengthy ( and very public ) solo interview in years. And he was super stoked to be there. “I’ve been gone for a while, so I’m kind of coming back, and I’m excited because I got all, like, serious for a while and I wasn’t as happy,” Hill explained to the Smartless trio of a quiet few years before returning to the spotlight with his recent Apple TV film Outcome . “And then I had my family and I got happy, and now all I want to do is be funny again. That’s why I said yes [to being on Smartless ]. I’m, like, I want to go fucking be funny in front of a crowd and that’d be awesome.” Hill appeared to have an awesome time with Smartless hosts Jason Bateman (a close friend he called a mentor), Will Arnett and Sean Hayes . The hour-plus conversation covered nearly his entire career, from his debut film role in David O.…