The Day of the Doctor - S7-E16
War Doctor: There's still a billion billion Daleks up there attacking
Eleventh Doctor: Yeah there is, there is.
Tenth Doctor: But there's something those billion billion Daleks don't know
Eleventh Doctor: Because if they did they'd probably send for reinforcements
Clara: What? What don't they know?
Eleventh Doctor: This time there's three of us.