A strange thing called 'lightbulb'

In this scene from "Wall-E", a computer-animated film produced by Pixar Animation Studios, Wall-E shows to Eve his favourite things, especially a lightbulb. In her hand the lightbulb lights up.

Not everything is what it seems

Finding Nemo is a 2003 American computer-animated film produced by Pixar Animation Studios. It tells the story of the overly protective clownfish Marlin, who along with a regal tangcalled Dory, searches for his son Nemo. Along the way Marlin learns to take risks and to let Nemo take care of himself.

During their adventure searching Nemo, Marlin and Dory are involved in a struggle with an anglerfish in the deep sea. This scene is very interesting because light, usually associated with positive and reassuring situations, in this case reveals a terrible and scaring one.

If I shine, all it's fine

In "Beauty and the Beast" (1991 animation film),

Lumière is an important secondary supporting character

Beauty and the Beast is a 1991 American animated film produced by Walt Disney Feature Animation. It centers around the love between a prince who is transformed into a beast and the beautiful young woman whom he imprisons in his castle.

During the film, many characters appear and Lumière is an important one.

Because of the curse placed by the Enchantress, he was transformed into a candelabra.

His three candles are lighted in positive situations but unlighted in negative ones. 

Eureka!

Edi is the Gyro Gearloose's little helper.

His name stays for 'Edison', the inventor of lightbulb

Gyro Gearloose is an inventor, a fictional character, an anthropomorphic chicken created by Carl Barks for the Walt Disney Company. He is part of the Scrooge McDuck universe, appearing in comic book stories as a friend of Donald Duck, Scrooge and anyone who is associated with them.

Edi, called Little Helper in English, is a small, humanoid robot constructed from pieces of metal and a lightbulb, which serves as his head. He acts as the assistant to Gyro.

In the Donald Duck comics, he is often shown as an inventor himself, sometimes copying Gyro's inventions.

Edi never speaks, but occasionally uses thought bubbles. He enjoys helping Gyro clean up the unusual consequences of his inventions.