7 Fortunate Accidents That Ended Up Saving Doctor Who

7. "Spack Off!"

Line flubbing is mostly considered to have been a trait of William Hartnell, the elderly First Doctor who seemed less like he was remembering rehearsed lines and more like he was trying to remember what he had for lunch in 1946. However, Tom Baker in Destiny of the Daleks ended up forcing “Stay back!” and “Back off!" into the human centipede portmanteau of “Spack off!”.

And of course it was left in. Destiny was so cheaply made that a primary school in Zimbabwe could have done it better. As such, fans have decided that it’s a Gallifreyan swear word. Presumably, when written in circular Gallifreyan, it resembles somebody showing their arse.