Fun

The Tenth Doctor states his name, rank, and intention as "The Doctor, doctor, fun." (TV: The Waters of Mars ^[+]Loading...{"timestamp":"03:24","1":"The Waters of Mars (TV story)"})

Fun was a concept.

When asked for his name, rank, and intention at Bowie Base One, the Tenth Doctor responded, "The Doctor, doctor, fun." (TV: The Waters of Mars ^[+]Loading...["The Waters of Mars (TV story)"])

The Eleventh Doctor once wrote in his diary that from 10am - 11am, he watched The Story of Tricey Beaker and Bear With Me on TV, which he described as "fun". (PROSE: The Doctor's Diary ^[+]Loading...{"page":"15","1":"The Doctor's Diary (DWA 308 short story)"})

Behind the scenes

In non-valid sources

Arnold Schwarzenegger: "I love having fun with those crazy Time Lords!" (TV: Series 1 Episode 6 ^[+]Loading...["Series 1 Episode 6 (Hedz TV story)"])

After tricking the Tenth Doctor into thinking he'd returned his DVD copy of Schwarzenegger to Arnie's Videos 400 years late, and demanding four million pounds, leading the Doctor to disappear, Arnold Schwarzenegger reflected that the Doctor hadn't been late in the first place, and that he loved having fun with "those crazy Time Lords". (TV: Series 1 Episode 6 ^[+]Loading...["Series 1 Episode 6 (Hedz TV story)"])

After the potato pie they'd tried to bake burnt in just fifteen seconds due to them travelling at light speed in the STARSHED, and the Alien King of Splargle was due to arrive expecting dinner in thirty, Doctor Doctor remarked to Poppy O'Toole that "time flies when you're having fun", to which she replied that she wouldn't know. (TV: The Alien King of Splargle comes for tea! ^[+]Loading...["The Alien King of Splargle comes for tea! (TV story)"])