Penny.
The Big Bang Theory Season 2, Episode 10
You proposed to Penny?
The Big Bang Theory Season 5, Episode 24
See a Penny, pick her up,
and all the day, you'll have good luck.
The Big Bang Theory Season 1, Episode 7
Mother, Penny and I really
want you to be part of this. Please stay?
The Big Bang Theory Season 10, Episode 1
Look, Penny, if you truly
want to be romantic,
The Big Bang Theory Season 7, Episode 6