Knock four times....

[fajrdrako]

Every time I see Doctor Who "The End of Time, Part 1" and the Doctor says, "He will knock four times," my brain starts to sing:

"...On the ceiling if you want me,
Twice on the pipes
If the answer is no..."

Which really just means that I've been listening to too much John Barrowman music and I can't be the least bit sorry about that.