Three girls in gold ' Native American ' costumes dance on a football field while several young men in dark blue uniforms play drums behind them .
There is a better than even chance that some people perform at the halftime of a football game .
There is a better than even chance that some people perform at the halftime of a football game .
Chances are slight that some people perform at the halftime of a football game .
Some people perform at the halftime of a football game .