Doctor Who: 20 Things You Didn't Know About The Ninth Doctor
16. He Smashed Every Mirror Inside The TARDIS
Steven Moffat's novelisation of The Day Of The Doctor is packed full of extra details that the episode couldn't accommodate, including some information on what the Ninth Doctor did shortly after regenerating from the War Doctor.
Apparently, he smashed every single mirror inside the TARDIS because he was ashamed of his destructive actions during the Time War, so much so that he never wanted to see his own face. Bye bye mirrors!
Of course, us viewers know that the Doctor actually saved Gallifrey rather than blowing it to hell, but the Ninth Doctor isn't aware of that fact.