Was practicing at a local track and we had a double-double right in the middle. There were some kids marshalling and running back in forth to shag cars as needed. I lined up for the first set and right then a kid took off running without looking to see what was coming. Ended up hitting him in the upper chest/neck with my Hyper TT.
He cried a little but shortly thereafter kids were asked to only marshal from the edges of the track in, not from the in out.