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Happy kitty, sleepy kitty"
Happy KITTY, sleepy KITTY
The Big Bang Theory Season 4, Episode 2
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Sing "Soft Kitty."
The Big Bang Theory Season 2, Episode 21
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This is Hello Kitty."
This is Hello Kitty.
The Big Bang Theory Season 3, Episode 6
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Happy kitty, sleepy kitty"
Happy KITTY, sleepy KITTY
The Big Bang Theory Season 1, Episode 11
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♪ Happy kitty, sleepy kitty"
♪ Happy KITTY, sleepy KITTY
The Big Bang Theory Season 12, Episode 19