
Ketchup started out as a general term
for sauce...
The Big Bang Theory Season 3, Episode 17

Hold on. Sheldon,
is there KETCHUP on that table?
The Big Bang Theory Season 3, Episode 17

...and her saying, "Nobody's looking.
Fill your pockets with KETCHUP."
The Big Bang Theory Season 8, Episode 18

Did you spill KETCHUP?
The Big Bang Theory Season 1, Episode 3

Heinz KETCHUP.
The Big Bang Theory Season 8, Episode 1