YouTube - Sort Of Dunno Nothin' - Peter Denahy
Funnily though my boys are not typically like this, at least not unless:
- they don't know you or
 - they know you but
 - they don't trust you or
 - you're being nosy or
 - it's none of your business or
 - they suspect you won't like the answer and it's none of your business anyway or
 - they're thinking about something else (or nothing in particular) right now.