What's the deadliest scifi weapon?

Phaser - Star Trek: The Motion Picture (1979)

Lawgiver - Judge Dredd (1995)

BFG 9000 - DOOM (2005)

M41a Pulse Rifle - Aliens (1986)

Point-of-View Gun - The Hitchhiker's Guide to the Galaxy (2005)

Noisy Cricket - Men in Black (1997)

Zorg ZF-1 - The Fifth Element (1997)

Light Saber - Star Wars: Clone Wars (2008)