Stream Piranha on Prime Video and Piranha 3D on Hulu.

Action movies have developed a great deal over the last 40 years. While there are some true classics among the bunch, it's clear to see that some outings made much bigger breakthroughs than others.

NPR's Megan Lim and Ryan Benk, two action sequence aficionados, discuss the elements of a great cinematic fight scene. DETROW: I think that was one of the first fight scenes that really stuck with me, ...