When your arms start T-Rexing (fore arms curl up to where your wrists touch your shoulders and your hands hang limp and floppy) with your body leaned forward and your head cocked back whilst you rapidfire-peck the air infront of you.
The bands lead singer was on point. Though the dancers reminded me of a geekin chicken.
If you aren't sure if you're going to run out of bobbin thread before finishing your current seam, but you keep stitching without re threading your bobbin, you are playing thread chicken.
I totally lost a game of thread chicken, and now I have to re-sew the entire fucking seam.