♪ Happy KITTY, sleepy KITTY... ♪
The Big Bang Theory Season 5, Episode 6
Happy KITTY, sleepy KITTY
Purr, purr, purr
The Big Bang Theory Season 10, Episode 20
♪ Soft KITTY, warm KITTY
The Big Bang Theory Season 12, Episode 19
♪ Soft KITTY...
The Big Bang Theory Season 12, Episode 23
♪ Soft KITTY, warm KITTY,
little ball of fur... ♪
The Big Bang Theory Season 5, Episode 6