As many Doctor Who fans know, the BBC has been doing charity clips over the past few years. A couple of years back it was David Tennant and Catherine Tate for Comic Relief:

The latest one is fantastic. Someone in our household was jumping up and down like a total fangirl fanperson with a massive stupid grin when she they saw it (no spoilers so you can watch - unless you've not seen the last series, particularly the last three eps):

The comment about The Master's beard had me highly amused.