"there can only be one"  

Commonly misquoted reference to the Highlander movies and TV series. The actual line is "There can BE ONLY one."

Wrong: "There can ONLY BE one" Highlander?
Right: "There can BE ONLY one" Highlander!

"there can only be one" by Shady Logic February 15, 2009

"there can only be one" 

Reference to the Highlander movie and telvision series, where a race of Immortals try to behead each other in single combat for a mystical "prize". Used as a battlecry.

red_mc to red_mc1: I was playing as a red master chief first, "there can only be one" .

"there can only be one" by chelydra July 31, 2007

"there can only be one" 

A commonplace quote from character Duncan McCloud in the TV series The Highlander which preceded the decapitation of his adversary by use of a sword.

McCloud: "there can only be one"
Nemesis: "No"

McCloud proceeds with a seemingly perfunctory decapitation

"there can only be one" by Daniel McCloud February 1, 2007

There Can be Only One 

The tagline from the film Highlander. It states that only one Immortal can claim The Prize, by being the last one to recieve a Quickening.

Connor McLeod: Kurgan, we meet again.

The Kurgan: There can be only one!

There Can be Only One by A. Fol April 10, 2010