Further proof that RTD should do a multiple Doctor story. That felt far too short! As with any multiple Doctor story, there was arguing and skience talk and exclamations of 'How awesome are we?' (and Old Skool music!). Massive LOLZ @ Five putting a verbal smackdown on Ten for his silliness. Totally IC, yo.
And this is TOTALLY CANON, just so you know. Stephen Moffat made it so.
Master reference = *major sniggering* Innuendo FTW!
And that bit at the end where Ten/Tennant kinda broke the fourth wall and thanked Five/Davison for being His Doctor! sdajfksadlfbadfa!!!! Sweetest thing ever!