Sure, sometimes it's fun to re-watch the trailers for games I've enjoyed and reminisce over them.
These are the two most recent ones which spring to mind right now and which I've re-watched and enjoyed even after having beaten the games themselves.
And if you want something
really nostalgic:
The fact I even remember the name of the trailer itself after 18-19ish years speaks volumes. It was one of the many trailers on one of those promotional discs that used to come with games, in this case my copy of Tomb Raider, and I remember re-watching that trailer so many times because of just how damned cool I thought it was. Re-watching it today almost two decade later... yeah, it's still damned cool.
Same with these which were on my Starcraft and later Diablo 2 cd:
Funnily enough Diablo 2 ended up being drastically different than what's depicted in that cinematic, but again... so cool!