Sharknado

Sharknado

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'Sharknado 5' Rains Down Swarm of Silliness

"Sharknado" jumped the you-know-what three movies ago, once Syfy parent Comcast sought to turn this unexpected social-media sensation into a money-munching, synergistic promotional machine. The latest edition, "Sharknado 5: Global Swarming," hardly reverses that trend but does fleetingly feel a bit more energetic, raining down a relentless barrage of silliness.