The Tour de France is one of cycling's three grand tours, which started last weekend.
During the race there were two crashes, one that was caused by a spectator. A woman with a sign that had a greeting for her grandparents written on it decided to step in the race area to show off the sign to cameras, but couldn't move out of the way fast enough. The sign hit a rider, who then fell off his bike and caused a domino effect pile-up of a bunch of riders and their bikes.
She's currently on the run as police search for her. She's facing a year in jail and the possibility of being sued by Tour de France.
Check out the video below to watch it all go down.