Last night was the end of an era, David Letterman’s final Late Show.

Late Night with David Letterman premiered on NBC when I was 9 years old. I remember quietly staying up well past my bedtime on many school nights in the 1980s to catch Letterman’s crazy antics. It turns out I had a penchant for absurdist humor of a kind that I may never have known existed until I saw David Letterman. Growing up in a rather socially conservative small town in the midwest, Letterman was one of a few key figures in opening my growing mind to the possibilities in a larger world. That sounds a bit overblown, but really, it isn’t. Letterman’s show on CBS has become such an institution over two decades — something that I’ve taken for granted, really, and not watched much in years — that it’s easy for me to forget just how huge David Letterman was to me in my formative years.

All of that came into sharp relief for me last night as I just barely managed to catch Dave’s final show. I knew he was retiring, and I had been reading enough about him lately to know that his final show was coming up sometime soon, but I didn’t know it was going to be last night until about 20 minutes before the show came on the air.

I found out about it because my college jazz band director mentioned it on Facebook.

I was lying in bed a little after 10 PM, idly checking Facebook on my iPhone, intending to set the phone down and settle into a crossword puzzle before going to sleep. Seeing that Letterman’s finale was imminent, however, I quickly changed my plans and turned on the TV. This was probably only the third time our bedroom TV has been turned on since we moved into the house last November.

There’s a lot packed into that last paragraph. The futurism of constant communication and instant access to the world of information via the ubiquitous pocket computers we call smartphones. How old I sound when I think of myself sitting in bed doing a friggin’ crossword puzzle. The shifting (and diminishing) cultural significance of broadcast television.

When Carson retired, it was a momentous event. It seems like from the ’60s to the ’80s, everyone watched — or at least had on the TV — The Tonight Show, on a nightly basis. As much as David Letterman revolutionized late night television and shepherded in a new era, he also came at a time of change he couldn’t control, and was both a victim and agent of a cultural shift that ensured his legacy would never be as great as that of his hero and mentor.

And yet, Letterman is the Carson of his generation, at least as much as anyone could have been. (Leno? Give me a break!)

Without a doubt my most vivid memory of Letterman, and honestly one of the most vivid memories of my youth, altogether, was Crispin Glover’s notorious, possibly drug-fueled, appearance in 1987 when he tried to kick Dave in the face.

I was delighted to see that moment in the rapid-fire montage of stills from 33 years of Dave’s show at the end of last night’s finale. It just wouldn’t have been complete without it.

That montage was a nearly perfect conclusion to a lifetime of late night TV. According to some reviews I’ve read this morning, it was the main portion of the show that Letterman had direct involvement in producing. And it was apparently Dave’s personal wish to have the Foo Fighters perform “Everlong” behind the slideshow, because that song touched him personally in his recovery from open heart surgery 15 years ago. (Fifteen years ago!) It occurred to me that this conclusion was almost like Dave’s life — his television life — flashing before his eyes. But not just Dave’s life, our lives, as his audience. Even though I haven’t watched his show regularly since I was in college in the mid-’90s, there were so many familiar sights in these final few moments that I realized that in a way, this was all of our lives. For 33 years millions of Americans have invited this weird guy into their homes on a nightly basis, and he has shared moments of absurd delight with all of us.

Thanks, Dave.