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

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 ...

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

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

A recent Primus show in Los Angeles turned into a revolving door of special guests that included one of the creators of South Park and members of Tool. Matt Stone Joins Primus Primus are hitting ...

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.