There are three types of accidents in the world of car racing: expected, freak, and “how in the [insert favorite expletive] did that happen?” Well, an accident involving an AMG racecar, air line, and four Mercedes DTM crew members falls into the latter of those three categories.

This is a clear example of a pit crew simply not following the most basic of pit rules: clean your crap off of pit lane after you’re done and secure your air hose properly until you are ready to use it. After a fairly quick pit stop by the AMG coupe during practice at Zandvoort on Friday, the coupe speeds away. The crew directly in front of the car apparently left their air hose dangling over the track in anticipation of a pit stop of their own and the car’s rear spoiler caught the hose.

Well, the hose turns into a massive bull whip with a crack that would make Indiana Jones feel inadequate. As it whips around, it catches four crew members and drops three to the tarmac. Luckily, no one was seriously injured, as Mercedes has released a statement that three of the four were released from the hospital and are back on the job, but one remains in the hospital with serious, but not life threatening, injuries.

From the 1:10 mark to the 1:15 mark, you can see the accident in slow motion and you can really get a look at how lazily wrapped the air hose is. The hose that the Mercedes hit was hanging halfway down, whereas the rest of the hoses in pit lane are tightly wrapped and well above the top of the spoiler.

We’re sure this team is in for a quick and harsh lesson on pit-lane maintenance and organization. Then again, getting bull whipped by an air hose may be lesson enough.