Lions assistant Gunther Cunningham freaks out over bad call

Despite the fact that his own head coach's ill-advised challenge flag made Justin Forsett's 81-yard touchdown run unreviewable, Detroit Lions defensive coordinator Gunther Cunningham had every right to be furious about the original call on the field in the third quarter of his team's 34-31 overtime loss to the Houston Texans.

Here's how the 66-year-old coach reacted to the turn of events on the sidelines. If Lions punter Nick Harris ever gets injured, we think Cunningham might actually have the form to replace him.

(Thanks to SB Nation for the GIF)