While they weren't actually acting at the time, they were still reacting to each other like the characters they play which was just too cute:
Takei: ...he's doing what he can to ensure his son has a good future
Masi: Yeah, but that's not going to happen.
Takei: We'll see about that.
Just about died with how they were with each other. Also, very weird hearing "Hiro" without the super thick accent.
Wonder who they'll feature tonight.