Shark Week, kickin' it old school all summer long since 1987. Thank you for celebrating our 27th year with us.

A diver grabs the dorsal fin of a great white and takes a ride.

Behold the beauty and grace of the shark.

A "shark eye camera" transforms a leopard-patterned swell shark into a neon green alien. This green biofluorescence helps swell sharks attract one another and camouflage themselves on the reef. From Shark Week 2015's "Alien Sharks: Close Encounters."

On Shark After Dark, Epic Meal Time's Harley Morenstein shows Josh and Taryn how to create "Human Chum." The secret ingredients: bacon and Nutella.

As thousands of people and blacktip sharks head to Florida for Spring Break, will great whites show up for an easy meal? From Shark Week 2015's "Shark Trek."

The Prince Edward Island shark (PEI) is the largest accurately measured shark on record. DNews and Discovery placed her at #2 in our countdown of the Top 5 Legendary Sharks.

Low on air, Andy and Devon head back to the boat in their one-man Shark Rovers, but a group of curious great whites have other plans... From Shark Week 2015's "Shark Alley: Legend of Dynamite."

Frustrated by Joan of Shark's elusiveness, the crew decides to "make it rain," showering Elise in chum. Will the blood bath do the trick? From Shark Week 2015's "Bride of Jaws."

It's lights, camera, action on the stealthy sevengill sharks, but the divers get a little more action than they bargained for. From Shark Week 2015's "Sharks of the Shadowland."

A Cuban shark expert takes a rather unorthodox approach to tagging sharks: grabbing them by the tail. These silky sharks remain unusually calm in his hands. From Shark Week 2015's "Tiburones: Sharks of Cuba."

On Shark After Dark, Blimp from "Voodoo Sharks" shows off his unique Shrimp Dance.

A giant white shark stakes her claim on the WASP, a one-man shark cage. Will she let the diver inside (Chris Fallows) escape with his life? From Shark Week 2015's "Air Jaws: Walking With Great Whites."

A shortfin mako, the fastest shark in the world, races after bait in this unprecedented perspective from Shark Week 2015's Monster Mako.

In today's countdown, Andy Casagrande reveals which Shark Week moment made it to fourth place!

The hammerhead shark uses its giant t-shaped head to detect the electric fields naturally given off by stingrays buried beneath the sand. From Shark Week 2015's "Ninja Sharks."