heads will roll

bang some heads together

Attempt to get results from a previously ineffectual or argumentative group, typically by coercion or force.

butt heads

To argue uncompromisingly.

call roll

To make a roll call; to take attendance.

dice roll

Something unpredictable or unexpected.

heads or tails

The practice of flipping a coin in the air, to choose between two alternatives based on which side lands face up.

heads-up

A warning or call to pay attention; an advisory notice; a notice of what is to happen; a holler.

ready to roll

Of a person, machine, vehicle, or plan, fully prepared to begin functioning and operating.

roll back the years

To produce a sense of nostalgia.