Are you Scottish/Irish?
Aren't you warm/cold?
Where are your pipes? They're in the car. Would you like me to go get them? I only use this one after my lessons, when I actually can go get them.
Do you play the pipes? What I do can't really be called "playing." That usually gets a good look.
Is there a parade today?
Why are you wearing that?

And my all time personal favorite - "Is that legal to do in public?"