Is a 3L jar of mustard really necessary for one person?

That’s what I found when I opened my fridge today

— By the way I live in a house with 3 roommates, 2 of which I don’t really know.

So I am going to assume the mustard belongs to the guy. But seriously, a 3L jar/container…I don’t even think a family like that ’31 and Counting Family’ buy that big of a mustard container.