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 Ma'am, that child would be me".

"Correct." And she dismisses him with a wave of her hand.

Trump is so impressed with this, he decides to try it out as soon as he gets back home. The moment he arrives, he summons Corey Lewandowski: "Corey, if your mother and your father have a child and that child was neither your brother nor your sister, who would that child be?"

Corey's voice crackles and he breaks into a sweat: "Boss, can I get back to you on this tomorrow...?"

"Sure, let me know tomorrow." says Donald.

Corey's in a flat panic. He Googles the heck out of it, even goes to page two. No positive answer. Ask Jeeves, Bing, Yahoo: nothing. Realising there is no hope, in a last ditch effort not to dissappoint his boss and for strategic importance, he calls Bernie, anonymously, of course: "Bernie, if your mother and your father have a child and that child was neither your brother nor your sister, who would that child be?"

Bernie answers: "Absolutely Corey, that child would be me."

Corey heads back to Trump tower confidently.

"Donald, I see now that child would be Bernie!" he exclaims.

"Wrong," yells Trump, "that child is David Cameron."