The guy on Guard in SOCAL this morning who responded to Delta's inadvertent call for push. It went like this:

DL XXX: "Ground, Delta XXX, push with Mike." (on Guard).

Guy: "Morning Delta, you're cleared to push."

DL XXX: "Cleared to push, Delta XXX."

Fortunately someone jumped on and said "Yer on GUARD."

I will admit, however, that it was kinda funny. It would have been less funny had it been a takeoff clearance...