Some men are all carrying a briefcase. It is big enough for three people and they are all carrying it.
There is a super-sized briefcase that is long and all three men are carrying it.
Why is the briefcase big enough for three people and why are they carrying it?
Not now—I'm in the middle of a big case.
scene: a workplace description: Some men are all carrying a briefcase. It is big enough for three people and they are all carrying it. uncanny: There is a super-sized briefcase that is long and all three men are carrying it. entities: Briefcase, Worker_cooperative. caption: Not now—I'm in the middle of a big case.
A play on words: to be "in the middle of a big case" to a lawyer would usually mean that they are busy in the process of litigating an important legal case. But here: the "case" is a literal briefcase, and the lawyer is standing in the middle of it.