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"Boy, do I hate it," I said. "But it isn't just that. It's everything. I hate living in New York and all. Taxicabs, and Madison avenue buses, with the drivers and all always yelling at you to get out at the rear door, and being introduced to phony guys that call the Lunts angels, and going up and down in elevators when you just want to go outside, and guys fitting your pants all the time at Brooks, and people always–"
"Don't shout, please," old Sally said. Which was very funny, because I wasn't even shouting."
"Why not? Why the hell not?"
"Stop screaming at me, please," she said. Which was crap, because I wasn't even screaming at her." (17.41-55)
Again we get subtlety. Twice Sally asks Holden to stop shouting—he insists he's not, but, you know, we don't quite believe him. The whole shouting/mumbling thing he’s apparently doing here sounds pretty cray-cray to us. (We’d cross the street, is what we’re saying.)
I would have walked […], but I felt funny when I got outside. Sort of dizzy. (24.2)
We’re not too surprised at this point that Holden isn’t feeling well—a lot of alcohol, not too much food or sleep—but the “funny” “dizzy” feeling is a little troubling.
"I had this terrific headache all of a sudden." (24.21)
A headache isn’t so surprising—but the fact that it’s a “sudden” headache is a little more eyebrow-raising. It sounds like Holden’s depression is getting really physical, really fast.