as someone who has obviously done extensive research on the topic i would like to present to you all...dyketennant's "which david tennant character are you" uquiz
It’s hard to beat David Tennant singing These Boots Are Made for Walkin’ while homoerotically dancing. If you haven’t seen Blackpool, this gives you a taste of the musical aspect of it. Source
I started watching Blackpool (because I'm still going through David Tennant's body of work, so to speak) - and in the first episodes DT's character is constantly licking something, including his own fingers. Is it intentional? :)
He's very much like the Doctor licking various things :)