Burr was among a number of celebrity and musician cameos when Primus played the Greek Theatre in Los Angeles on August 6.

Bill Burr sat in with members of Primus and Tool during a performance of "Too Many Puppies" at the Greek Theatre.

If you were scrolling through on Instagram late last night, you might have seen some unhinged clips on the BroBible account, thought, "Is that... uhh Bill ...

Primus with Ty Segall, image via YouTube Last night, Primus stepped into the spotlight at Los Angeles’ iconic Greek Theatre ...

Ty Segall did vocals on a cover of Black Sabbath’s ”N.I.B.,” which Primus performed with Puddles Pity Party last month.

Primus pulled in an eclectic list of surprise guests for its show last night (Aug. 6) at Los Angeles' Greek Theatre.

The actor-comedian and his North Hill Productions banner will develop original scripted and unscripted comedies for the ...

Primus, of course, plays the theme song to South Park, which is currently in the middle of its 27th season. The band also ...