Matt Smith's iconic catchphrase "Geronimo!" began in his Doctor's regeneration scene. Smith's use of "Geronimo!" became a fan favorite, tying him to one of Doctor Who's most iconic runs.

and called the question the 'Scariest Doctor Who catchphrase... Ever! Sends a shiver down my spine every time I hear it'. Rose agreed: '...those four words can still send a chill up my spine ...

But Doctor Who's modern reboot could have been an epic failure. Looking back now, it feels like a stroke of beautiful madness ...