There was certainly a meeting of these actors in a different setting to the one you describe...
"Maverick", another film by "Lethal Weapon" director Richard Donner, contains a scene where a bank robber (Danny Glover) is unmasked by Brett Maverick (Mel Gibson) and they look at each other as if they know each other from somewhere else, at which point the title music from "Lethal Weapon" plays in the background.
Can't help any further with your office scenario though.