Great minds

This one just came into my head the other day, from the first NuWho episode:

Rose Tyler:  If you're an alien, how come you sound like you're from the North?
The Doctor:  Lots of planets have a North!

Christopher Eccleston has a strong Manchester accent, and it's a nice little indirect callback to the fact that, up until relatively recently in the grand scheme of things, if you wanted to work as an actor in the UK you had to lose your regional accent.  Many people who you think of as having very typically plummy Received Pronunciation British accents didn't grow up speaking that way.  Tom Baker, for example, is from Liverpool and Patrick Stewart is from Yorkshire.  (And actually the Sixth Doctor, Colin Baker, was also from Manchester.)

Also from Pirates 3: Jack is about to escape from Beckett's ship by tying himself to a rope slung over a yardarm and tied to a cannon, in an attempt to launch himself over to the Black Pearl.
Beckett catches him in the act, exclaiming "you're mad!"
Jack responds, "Thank goodness for that! If I wasn't it would probably never work."

Also a more subtle one from Pirates 1: Gibbs introduces Mr. Cotton, whose tongue has been cut out. So, Gibbs says, "He trained the parrot to speak for him......no one's yet figured out how."

Now that I think about it, Pirates did this a lot.

"For the next year, we'd see him going through other windows in the neighborhood. He'd wave, and we waved back. Nice man. Very helpful."