Well, that was... different.
Assuming Yahtzee wasn't deliberately trying to be bland, what this video illustrates is something everyone who aspires to be an internet sensation should know -- genuinely spontaneous improv is hard. You can't just point a camera at someone, give them the note, "Be funny," and then shout, "Action!" Unless they're Robin Williams, it just doesn't work like that.
Yahtzee: I sincerely hope you got a chance to visit the Smithsonian.
Also: I didn't know Washington D.C. was a console title (as indicated by the icon on the title card).