Watch video of the moment below.

The incident occurred Friday evening at Glendale, Arizonas Desert Diamond Arena.

The singer was performing her song What Was I Made For?

Billie Eilish on stage

Billie Eilish at Madison Square Garden October 16, 2024Kevin Mazur/Kevin Mazur/Getty Images for Live Nation

Eilish flinches, briefly goes silent as many in the crowd yell No!

to the tosser (someone can be heard shouting what sounds like Im sorry).

Watch on Deadline

The moment was a reminder of a spate of such incidents last year.

Lady Gaga, Stevie Wonder, Billie Eilish and Red Hot Chili Peppers are among the performers at FireAid

Alright, who threw it?

Bryan said to the audience.

Lets not be dicks, huh?

Throw stuff at concerts?