Right before Holden leaves Pencey at night, he shouts at the top of his lungs, "Sleep tight, ya morons!" and presumably wakes up the entire floor. Most of the witty narration also qualifies, in a very tragicomic way.
And after the aforementioned shouting, he stumbles while fleeing down the stairs because of some stray peanut shells and nearly 'breaks [his] crazy neck'.
Just imagine what it would look like if Holden's tombstone was made up the way he said near the end of the book:
Holden Caulfield [date of birth]-[date of death]
Late in the book, Holden tries reading a magazine to get his mind off of things, but it only ends up depressing him, for good reasons.
But this damn article I started reading made me feel almost worse. It was all about hormones. It described how you should look, your face and eyes and all, if your hormones were in good shape, and I didn't look that way at all. I looked exactly like the guy in the article with lousy hormones. So I started getting worried about my hormones. Then I read this other article about how you can tell if you have cancer or not. It said if you had any sores in your mouth that didn't heal pretty quickly, it was a sign that you probably had cancer. I'd had this sore on the inside of my lip for about two weeks. So figured I was getting cancer. That magazine was some little cheerer upper. I finally quit reading it and went outside for a walk. I figured I'd be dead in a couple of months because I had cancer. I really did. I was even positive I would be. It certainly didn't make me feel too gorgeous.