Wiz Khalifa is known for being a fan of marijuana, but his enjoyment of weed may have caused an awkward moment on Conan.

The late night show host was in the middle of his monologue when the smoke alarm in the building went off.

Conan O’Brien stopped telling his jokes to ask if something like that had every happened before. One of the production workers off camera then tells him that Wiz Khalifa is in the building.

“You’re blaming the band?” Conan says jokingly.

“Well, it’s because it’s the smoke alarm,” replies the show’s sidekick Andy Richter.