Before your containment unit explodes thinking this is a sign about the ever present Ghostbusters 3 rumors, Twitter and Access Hollywood report he said this on stage "It doesn't mean anything, it's just the only thing I had clean." Classic Murray. Here are the photos we have so far. Many can be clicked for larger versions.
Meanwhile, there's one thing we can take away from this... if Murray is indeed reviewing the third film's script right now, he just showed a hearty love for the boys in grey and probably got a lot of love back, in the form of a standing ovation.
Bonus stage approach pic.