During the GoPro Grand Prix of Sonoma, Will Power and Scott Dixon hit the pits at the same time. After swapping tires, Dixon took off as Travis Law, a crew member for Power's car, was carrying a tire away from the pit. Dixon's rear tire clipped Law's handheld tire and the speed sent it flying into Law and Law into another crew member. Both men fell to the ground in a scary-looking moment, but eventually got up under their own power.
Update: Dixon cries foul: "A bit of a dick move."