That's also how I practically got t.b. and came out here for all these goddam checkups and stuff.

from J.D. Salinger – The Catcher in the Rye (Chap. 1) on Rap Genius

Meaning

This is our clue that Holden did not, as many readers claim, end up at a hospital for psychiatric treatment but rather for tuberculosis treatment. However, Holden could be hedging the truth, he’s a textbook example of an Unreliable Narrator. The final two chapters make it sound as if he had a breakdown or near-breakdown as well — it is likely that, while he is there because of his TB, he is at least under some form of psychiatric evaluation.

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