The double cluster in Perseus!
I got to give it a 5. I observe from the San Francisco Bay Area in bortle 8 by my weather app plus three porch lights and a street lamp. I may have even seen them, the double clusters before but because of the light pollution they never jumped out at me.
But this time I had my new to me second hand 10 inch Dob and my ES 28mm 68° eyepiece and the chief culprit porch light was off. I'd been out for a while watching Orion climb over the eastern foothills.
And then I turned the rig north to bring the tube upright for storage and there it was like two piles of diamonds. It took me an hour and three looks with every eyepiece to call it a night.
Double cluster is always fantastic. Get yourself out to a really dark sight where it becomes a naked eye smudge between Cass and Perseus and then take a look. It is breathtaking. No matter what my observing goals are, if it's up, I always pay it a visit.
Mine was 20 years later nearly with a 40mm refractor and M42. At this point I only knew from color photos and so on what nebula were with zero idea how this might translate at the eyepiece in this little scope. I looked in the area and saw stars only. After a time I noticed a peculiar haze in the field. Altitude was a bit low, light pollution etc. . But what the heck was that non-starlikehazy thing that disappeared altogether at times? I hung with it... I knew something strange was in view I just couldn't bring it home and call it. Little by little it filtered into my head, "ahhh can this be what it really looks like through a small scope?". An hour later I was inside my Dads studio on the thick pile blue carpet that covered the floor with a Time-Life book on the universe. M42&43 had this rich two page spread in all its red, white and some blue glory. I knew that was it. I only had a piece of it for all my backyard efforts but a piece was golden and it ushers in so many more mystical glowing beauties.
I love this story. This is why we get addicted. And like the last one, this is one of my "old friends" that I always visit when it's up.