Leonard can't process CORN.
The Big Bang Theory Season 1, Episode 1
Corn dogs didn't come into existence
till the first half of the 20th century.
The Big Bang Theory Season 2, Episode 2
There were days I wanted
to fill his pockets with CORN
The Big Bang Theory Season 9, Episode 14
I'm still waiting on my mini CORN dogs
from two years ago.
The Big Bang Theory Season 8, Episode 2