[Mears]

I just watched it about 5 times——I haven’t a clue what it is.

Maybe someone behind the car tossed a drink.

.

.

[misanthrope]

There’s a clicking or thumping sound associated with it too. Almost resembles one of those crowd control pepper balls.

[Bon mots]

Sounded and looked like someone tossed an open can of beer.

Or it could have been on the ground from the drinking migrant and one of the guys kicked it.