Kingsman: The Secret Service (2014), "Exploding heads"
Here's a bonus: a balletic collection of 216 exploding heads is not something you might expect to see in a spy movie, but it's the centerpiece of Kingsman: The Secret Service. What might at first seem like a sequence full of horror and gore is actually the film's funniest scene, scores of villains succumbing to a chip implanted in their necks. Director Matthew Vaughn turned to French visual effects studio Buf to realize the shots with rainbow-like fireworks and mushroom clouds.
Since the main head splatterings all take place in under one minute, Buf quickly communicated the ridiculousness of the explosions with a four-tier effects shot: ignition, a splattering watermelon effect for the head breaking into pieces, a shockwave, a smoke cloud, and a mushroom cloud. Each element was all built inside the VFX studio's proprietary simulation software, and, once rendered, was tracked onto each villain's head.