Penny was the teacher.
When the light turned YELLOW...
The Big Bang Theory Season 3, Episode 16
No sunflowers. I don't like YELLOW.
Game of Thrones Season 5, Episode 2
All I see is
a YELLOW smudge.
The Big Bang Theory Season 12, Episode 4
"putting a terrifying,
giant YELLOW bird on television
The Big Bang Theory Season 12, Episode 4
Yellow is
The Big Bang Theory Season 5, Episode 14