Lightsaber

A Lightsaber is a fictional weapon from Star Wars.

History
uses a lightsaber when he appeared at Bi-Mon-Sci-Fi-Con. He knocked over a cutout of Wonder Woman with it.

A lightsaber appeared in a Star Wars poster.

, dressed as Iron Man, and, dressed as The Hulk, were having a fight with lightsabers as part an act.

In the Cosmic Wars: Holiday Special, a parody of Darth Vader cuts a turkey with a lightsaber for his family.

gives Bart a fully functioning lishtsaber, which he uses to destroy a tree.

A lightsaber is seen in a poster in the sanctuary Comic Book Guy creates underneath Mr. Burns' mansion.

Non-canon
The Collector had a boxed Darth Maul Limited Edition Double-Edged Light Saber, which he opened and used to fight Stretch Dude and Clobber Girl.

Comic Book Guy chases after Bart and Milhouse, and later Martin, with a lightsaber.

When the bullies are attempting to mug Lisa and Milhouse, Jimbo pulls out a miniature red lightsaber.

Bart's giant LEGO robot uses "lightsaber barf", complete with lightsaber sound effects.

Bart asks Gandalf the Grey if he could destroy the ring with a lightsaber.

Professor Frink uses a lightsaber to cut open a "suspect" shark.

Homer fought Obi-Wan Kenobi with lightsabers.

The Simpson family dressed as Star Wars characters and had lightsabers.

The Simpsons: Tapped Out
The Collector has a task to "Practice Swordsmanship" which has him using a double-bladed lightsaber.