A strange start to Sunday's Windows 10 400 at Pocono Raceway continued as green flag pit stops cycled through at Lap 58 of 160.

Team Penske's Brad Keselowski brought his No. 2 Ford to pit road from the lead, but the stop went terribly wrong for the 2012 Sprint Cup champion.

Keselowski locked up the brakes and slid through his pit stall just as crew members jumped off the pit wall and approached his car. The front tire changer jumped over the right-front corner of the car, while the tire carrier jumped onto the hood, losing the tire in the process.

Jackman Braxton Brannon got the worst of it, as he jumped to avoid the car, but was clipped by the left side of Keselowski's Ford. Brannon was turned in the air, landing hard on his back as the jack went flying and narrowly missed landing on top of him.

None of the crew members involved were injured in the incident.

"I'm sorry about that guys. Everybody OK?" Keselowski radioed to the crew after the stop. Crew chief Paul Wolfe simply said, "We'll get through it."

Keselowski was black-flagged for an uncontrolled tire, which was sent rolling down pit road. The tire stopped in the middle of pit lane, forcing NASCAR to throw the caution flag.

When the race restarted on Lap 66 of 160, Keselowski was 37th, one lap down to the leaders.

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