Extracted from http://en.wikipedia.org/wiki/Glen_Jacobs:
One week later, Kane and Big Show faced Spirit Squad members Johnny
and Nicky in a title rematch, but were disqualified after Kane
"snapped" (ostensibly due to "voices in his head") and began
hurtling chairs into the ring. Following the match, Kane delivered
chokeslams to the Spirit Squad, the referee and Big Show himself.
Kane and Big Show confronted one another on the next episode of
RAW, leading to a match between the two being scheduled for
Backlash 2006 on April 30, 2006. In subsequent weeks, Kane began
attacking anyone who mentioned the date "May 19" (the scheduled
release date of the film See No Evil and the date on which, in
1998, much of the information on the childhood of the Kane
character was initially revealed). On the April 24, 2006 episode of
RAW, Kane attacked Big Show, targeting his eye. During the match
between Kane and Big Show at Backlash, Kane's voice began echoing
througout the arena saying "May 19", "They're all going to know",
and "You can't hide from it," and "Do You Know what happened on
that date?" leaving Kane visibly shaken. Big Show then struck Kane
with a chair, silencing the voices, and left the ring, resulting in
a no contest. The next day on RAW Kane was in a match against Rob
Conway with Shawn Michaels as the guest referee that ended with a
tombstone piledriver.
On the May 8, 2006 edition of Raw, he had a one on one match
against former tag team partner Big Show. After exchanging blows,
he heard the date May 19 and saw a video resembling his old mask.
He was then sent to a chaotic frenzy and started hitting Big Show
with a total of 11 chair shots.
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I dunno WTF wif Kane when big show or crowds mentioned tis word to
him n he will turn berserk n attack someone. is kane going to turn
heel? 