* FanNickname: David [[BiggerIsBetterInBed Ten-Inch]], courtesy of Creator/BilliePiper (though Creator/JohnBarrowman certainly helped matters).
* HilariousInHindsight: In his interview before ''Film/HarryPotterAndTheGobletOfFire'' premiere, he mentions that he will never have [[{{Series/DoctorWho}} this big of an audience again]]. Possibly intentional on his part, as he'd already been cast as the Doctor by this point.
* MemeticMutation:
** "Allons-y!" amongst others like "I love a little shop" and "I'm sorry. I'm so sorry."
** [[Creator/JohnBarrowman BARROWMAN!]] [[Series/NeverMindTheBuzzcocks *shakes fist*]]
** [[https://www.pinterest.com/eruannatook/david-tennant-in-places-he-shouldnt-be/ David Tennant in places he shouldn't be.]]
* SacredCow: You have no idea. He is worshiped immensely on the internet thanks to his Doctor Who role as the Tenth Doctor.