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When the Kansas City auditions of The X-Factor air — sometime after the Sept. 12 premiere — listen for the word "tiger."

According to Us Weekly, X-Factor UK judge Louis Walsh filled in for a sick Simon Cowell during the June 8 auditions and he taught the U.S. judges a funny word game he likes to play overseas.

The judges reportedly picked a word before each contestant performed and then all tried to use it during their critiques. "Every time one of them said the word, they all started giggling like naughty school children," the source told Us Weekly. (And here we thought the judges actually wanted to help contestants improve and succeed — nope, they just want to amuse themselves!)

Us Weekly's source says Britney Spears chose the word "tiger" and judge L.A. Reid told one contestant he looked like a tiger in his tank. Demi Lovato giggled and said "I can see a tiger in action." Britney said "he was like a big tiger."

So at least the judges can bond while Simon is out — while the tiger's away, the mice will play!

Source: UsMagazine.com