Wow! I wrote a article for my school newspaper titled this. It was about Freshmen visitation hours.

I think the title means "seize the night" in Latin just as carpe diem means "seize the day" in Latin.

Ok,technically was that Angelus that turned up
after the old guy in Angel's body got the Happy,
or is that only when Angel's in Angel's body?

Technically it's Angel's body with the Old man's soul in it.

It wasn't the old man's soul. It was that demon that takes over bodies. But if that's true then why inhabit an old body with a weak heart? Anyhow, I thought it was just the one demon.

There was a demon? I didn't get that at all. I thought it was just the Old Man doing it himself. He traded souls, essences, minds, whatever you want to call it with Angel.

Unless you're somehow talking about the Demon that is Angelus.

The burning question of this episode is: if possessed Angel had found a moment of bliss--would he have lost his soul? Does the curse follow the vampire, or the soul?

The other burning question is, if I get only one Monday night this whole season where I'm *not* working, was this a good one? Sigh....

I think if Angel lost his soul in the old man's body, then he'd become a weak old but very mean and nasty old man. He probably wouldn't last long.

Well, not mean and nasty all the time. Angelus wasn't always mean and nasty.

You are actually copying (Paying tribute to, if you will) a first century poet named Horace. He originated the term "Carpe Diem" (Seize the day) as a encouragment to lose one's virginity. Since this was Rome, it was written to teenage boy, but that is another story.

It took Marcus way too long to realize he was a vampire. I mean, if you had no pulse or body temperature, wouldn't you notice?

I saw this ep today on disc 2 of the new Season Three DVD set (hadn't seen it since it first aired) and got a mild surprise: the rotund orderly Ryan is played by Steve W. Bailey, now known as the titular "Big Fat Obnoxious Fiancé"! Turns out he also played a cave demon in 3 Buffy eps, too.

There was nothing in this episode to suggest that Marcus was a demon, though nothing in the episode precludes that posibility. Most likely, Marcus was just an old human guy (played by Ron Howard's dad, Rance Howard), who liked to swap bodies with much younger human guys by transferring souls between bodies.

Regarding what would have happened if Angel had experienced a moment of true happiness while his soul inhabited Marcus' body, Angel's soul likely would have left Marcus' body to inhabit "the ether", as it did when Angelus resurfaced in "Buffy" season 2 and "Angel" season 4. That would have left Marcus' body without a resident soul. In the Buffy/Angel-verse, this is uncommon for humans, but not uncommon for demons, and the "Angel" season 1 episode "I've Got You Under My Skin" implied that the demon-possessed human boy had no soul.

I'd add to my previous comment that if Marcus' body was left without a soul, then without a resident backup consciousness (as in the case of Angel's body), Marcus' body would probably be inanimate, if alive at all.