Doctor Who star David Tennant's last few episodes air later this year. We're already grieving and re-watching all his episodes, and we've noticed he says "Sorry" an awful lot. Here's a video of the Tenth Doctor saying "Sorry" 120 times.
Seriously, if "Fantastic" was Christopher Eccleston's catch phrase as the Doctor, we've decided that "I'm sorry" is Tennant's. What's fascinating is to watch all the different ways Tennant can apologize, from flippant mania to utter agonizing sincerity. That one word actually captures something about the range of emotion his Doctor displays. Matt Smith has a lot of work to do to win us over, after Tennant.