Because it's his only chance to open the door to Number 10!
A: When the door is open.
You open it slightly so it's ajar.
A: The lid said, "Twist to open."
Ever opened a grilled-cheese sandwich?
Because he only ever takes sum of the numbers!
As many as 27. I'm referring to the number of times good ol' 27 was reposted.
A Fairodactyl