"Tell- us- your- name," demanded the Dalek Emperor as his Daleks surrounded Rose. "Tell- us- your- name- and- the- female- lives."
Nine, broken and desperate and afraid, suddenly didn't care about anything that would happen.
The world seemed to stand still.
He opened his mouth and spoke:
"Ring-ding-ding-ding-dingeringeding! Gering-ding-ding-ding-dingeringeding! Gering-ding-ding-ding-dingeringeding..."
If you don't get it, it's a reference to the viral (in America anyway) song Ylvis's "The Fox", in which they claim that the sound a fox makes is "an ancient mystery", just like the Doctor's real name!