A huge crowd of supporters gathered peacefully near the Eiffel Tower on Sunday to celebrate Paris Saint-Germain's victory, which was marred by violent clashes overnight that led police to detain hundreds of people.
At ballparks all across the country, groups consisting of mostly young men are joining in on the trend: Go to the section where the party is happening, take off your shirt and start twirling it above your head.
Several spectators were hurt in a crash at a demolition derby in Tulsa, Oklahoma, when of the cars broke through a safety barrier and went into the crowd.