I made a papercraft TARDIS tree topper for the office Christmas tree (which I later took home for my own Christmas tree, cause I'm selfish like that). This conversation happened, nearly verbatim, shortly after the TARDIS was unveiled. The guy actually thought he knew what Doctor Who was, but when he said "red telephone booth" (while looking at the blue police box) well, the truth was pretty obvious.
In other news: merry Christmas! This will probably be the only themed strip, and maybe even the last strip of the year. If you need me on the 25th, I'll be in front of the television, mourning the death of a Doctor.