![This is Hello Kitty.
This is Hello Kitty.](https://content2.mcqstudy.com/ss/tbbt-3-6-00:12:54.301.jpeg)
This is Hello Kitty.
The Big Bang Theory Season 3, Episode 6
![♪ Happy kitty, sleepy kitty... ♪
♪ Happy kitty, sleepy kitty... ♪](https://content2.mcqstudy.com/ss/tbbt-5-6-00:20:51.189.jpeg)
♪ Happy KITTY, sleepy KITTY... ♪
The Big Bang Theory Season 5, Episode 6
![♪ Happy kitty...
♪ Happy kitty...](https://content2.mcqstudy.com/ss/tbbt-12-24-00:06:42.445.jpeg)
♪ Happy KITTY...
The Big Bang Theory Season 12, Episode 24
![I sing you I sing you](https://content2.mcqstudy.com/ss/tbbt-5-18-00:18:26.936.jpeg)
I sing you "Soft Kitty"
The Big Bang Theory Season 5, Episode 18
![(SINGING)
Soft kitty, warm kitty
(SINGING)
Soft kitty, warm kitty](https://content2.mcqstudy.com/ss/tbbt-6-22-00:19:11.164.jpeg)
(SINGING)
Soft KITTY, warm KITTY
The Big Bang Theory Season 6, Episode 22