Ogron 2 (Doctor Who? 151)

An Ogron was one told the joke "How do you tell the difference between an Ogron and a plank of wood?" by another Ogron. He didn't know the answer and asked the question back to the other Ogron but the other Ogron forgot he was the one initiated the exchange and requested the punchline from him. This continued for some time. (NOTVALID: Doctor Who? 151)