Penny lied about graduating
from community college...
The Big Bang Theory Season 2, Episode 1
Penny. Penny. Penny.
The Big Bang Theory Season 4, Episode 1
[PENNY SIGHS]
The Big Bang Theory Season 8, Episode 18
PENNY:
Absolutely not.
The Big Bang Theory Season 5, Episode 13
and waste his time kissing Penny
The Big Bang Theory Season 7, Episode 2