6 things you missed at Bonnaroo Saturday

MANCHESTER, Tenn. — The third day of the Bonnaroo Music & Arts Festival brought out the stars. Not only did festivalgoers see sets from big-name acts like Mumford & Sons, Hozier, Childish Gambino and Slayer, but musicians sat in on each other's sets and celebrities started showing up in the strangest places.

Bleachers is a smash. As Bleachers closed an energetic afternoon set with its biggest single, I Wanna Get Better, frontman Jack Antonoff began throwing his guitar into the air repeatedly. Eventually, he smashed it into several pieces, handing the neck to Cindy Recinos of Connecticut, then distributing the rest to other audience members.

"It's not even that I want to smash my guitar," Antonoff said afterwards. "I want to give my guitar. I feel like by smashing it into pieces, I can give out more pieces and it's more exciting. I've done that only a couple times. I throw it, and sometimes I catch it. Ninety percent of the time, I catch it. Tonight, I didn't try to catch it."

Antonoff's parents, Rick and Shira Antonoff, who came from New Jersey to watch their son perform, had a slightly different perspective: "We knew he was going to smash the guitar," Rick said, "because he got that look in his eye that he got when he was a little boy."

Don Draper never did that. Belle and Sebastian fans got more than expected during the Scottish band's early-evening set. Shortly after Zach Galifianakis introduced the group, Jon Hamm came on stage, too — and proceeded to throw gummy bears into frontman Stuart Murdoch's mouth.

My Morning Jacket's evening set. My Morning Jacket has become closely associated with Bonnaroo, having delivered epic sets in the rain and in the early-morning hours. Their set Saturday had no special circumstances other than a great rock band playing extended versions of their songs on the festival's biggest stage as night fell. The group played an 18-song set that heavily featured material from the group's new album, The Waterfall, released last month. Several songs ended with sustained bursts of noise, often continuing into the next number, and singer-guitarist Jim James grinned and spread his arms wide, giving the audience two big thumbs up when he seemed especially pleased.

Mumford and Sons got a little help from their friends. Two years ago, Mumford & Sons had to cancel a scheduling headlining appearance at Bonnaroo when bassist Ted Dwane required emergency brain surgery. The band made good on that previous commitment Saturday night, with a set that combined the acoustic songs of albums Sigh No More and Babel with the electric ones of this year's Wilder Mind. Early on, the group had actor Ed Helms sit in on banjo during Awake My Soul. Mumford and Sons had an even bigger surprise during the encore, when they brought out members of Hozier, My Morning Jacket, Dawes, War on Drugs and Helms to join them for a cover of With a Little Help From My Friends modeled after the version Joe Cocker did at Woodstock in 1969.

All-star dance party. Each year, Bonnaroo has at least one SuperJam featuring members of several acts from different genres. This year, a Throwback SuperJam Dance Party had '70s and '80s hits continuing into the early hours of Sunday morning. Rapper Chali 2na led the crowd through Grandmaster Flash's The Message and a few bars of Tag Team's Whoomp! (There It Is). Bleacher's Jack Antonoff sang Bruce Springsteen's Dancing in the Dark and Talking Heads' Psycho Killer, then returned later for more songs.

Jordan Kelley of Cherub fronted a version of Cameo's Word Up, while Metallica bassist Robert Trujillo was featured on renditions of Ozzy Osbourne's Crazy Train and an arrangement of his band's Enter Sandman with a horn arrangement. Other feature singers included Jamie Lidell (Marvin Gaye's Sexual Healing), Rhiannon Giddens (The Police's Roxanne) and SZA (Michael Jackson's The Way You Make Me Feel).

Make a wish. Throughout the weekend, festival organizers have occasionally granted wishes to attendees who use the Twitter hashtag #rooish. "You'd see things like Gold Bond and pizza," said Sara Suhr of Lexington, Ky. "One person even got a ticket to Bonnaroo for his mom, which I thought was really sweet. " Suhr and her friend Riley Ferguson, who also came to Manchester from Lexington, wanted to get an aerial view of Bonnaroo. "I wished for a helicopter ride across Bonnaroo with my friends," Ferguson. "'Wish Granted' popped up on my phone, and I was so excited I fell out of my car." The two 18-year-olds got their ride early Saturday afternoon. Ferguson's takeaway from the air: "The lines really are that long. They wind around everything."