Riddles, jokes and others

These are just mini stories that I didn't feel like writing a whole long plot to. Thanks for reading! :) (All characters and settings taken from the show belong to BBC and Steven Moffat, Russel T. Davies, and any future or past writers of Doctor Who.)

(This did not really happen. This is made entirely out of my imagination) What if you ran into someone and they offered to drive you home? What if this man was David Tennant?