Donald Trump goes to meet the queen... ...while there he is most impressed with the service she recieves from her butlers and staff and he asks her how she gets such good employees. She says she screen them for intelligence and proceeds to demonstrate by summoning David Cameron: ""Come here, David. Now answer me,"" she starts, ""if your mother and your father have a child and that child is neither your sister nor your brother, who is that child?"" David looks a bit flustered but answers: ""Why M…