Authorities Surround Shirtless Man Standing on Iconic L.A. Bridge

A shirtless man was atop a bridge in Los Angeles with cops and firefighters surrounding the area ... and we've got video of the bizarre scene.

It went down at the Sixth Street Viaduct in Downtown Los Angeles ... a landmark film buffs may recognize from iconic movies like "Grease" and "Terminator 2: Judgment Day."

At one point, it appeared the man lit his shirt on fire while law enforcement continued to surround him on the ground below.

For those thinking this individual might come down once he gets bored, we're not convinced ... because it seems he brought paper up onto the bridge with him -- and he's making and throwing paper airplanes off the top of the structure to entertain himself.

New stations carrying the situation live, moved on to other programming ... so as far as we know right now, the dude is still up there.