I crossed the border twice yesterday.  I don’t ever seem to have a problem getting asked a bunch of questions any more. I came up with a technique.  First, I have the radio playing moderate rock music as I pull up to the kiosk. (Yesterday it was the Sheepdogs). This is turned off as I roll down my window a little further.  The important part is to face the guard and remove my sunglasses just before handing over the passport.  Then?  Eye contact. Unbroken, unflinching eye contact.  Until they drop their eyes.