Verra interesting.
(aside to McTag--my heart's in the highland achasing the hart)
Ham and eggs is a delicious breakfast.
What we're talkin' about here is subject-verb agreement, right?
Once more. Grammar is the study of the parts of speech; the parts of a sentence; the phrase and the clause. Usage is another category; sentence structure another, etc.
The fault, dear Brutus, lies not in the stars, but in the translation.