
Plain old Howard Wolowitz
is the best guy I know.
The Big Bang Theory Season 6, Episode 5

Is that PLAIN enough for you?
I want them both dead.
Game of Thrones Season 1, Episode 5

I don't think PLAIN oatmeal
was the point of that story.
The Big Bang Theory Season 10, Episode 23

Just PLAIN old Howard Wolowitz again.
The Big Bang Theory Season 6, Episode 5

Just this morning, PLAIN as day.
Breaking Bad Season 5, Episode 16