Ok, how about this for an idea. We take it in turns to post a favourite (British spelling) comic cover every day. This went really well on the comic fan website that I used to frequent. What we tried to do was find a theme or subject and follow that, until we all got bored with that theme. I'd like to propose a theme of letters of the alphabet. So, for the remainder of October (only 5 days) and all of November, we post comic cover pictures associated with the letter "A". Then in December, we post covers pertaining to the letter "B". The association to the letter can be as tenuous as you want it to be. For example I could post a cover from "Adventure Comics" or "Amazing Spider Man". However Spider Man covers can also be posted when we're on the letter "S". Adventure Comic covers could also be posted when we're on the letter "L" if they depict the Legion of Super Heroes. So, no real hard, fast rules - in fact the cleverer the interpretation of the letter, the better, as far as I'm concerned.
And it's not written in stone that we have to post a cover every day. There may be some days when no cover gets posted. There's nothing wrong with this, it just demonstrates that we all have lives to lead.
If everyone's in agreement I'd like to kick this off with one of my favourite Action Comic covers, from January 1967. Curt Swan really excelled himself here.
Discussion and voting on future monthly themes takes place on the "Nominations, Themes and Statistics for A Cover A Day" thread. Click here to view the thread.
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My favorite ghost-related Superman story is from Action Comics #379 (1969), which unfortunately fails to sell that premise on the cover (but not in the story proper). It makes excellent use of Superman's secret identity as Clark Kent and could very easily have been used to change the direction of the character if the editorial willingness to do so existed at the time. Even today, I have rarely seen Superman feel so vulnerable as in this story.

I also recommend Superman #186 (1966).
Not ghosts, but Superman's meeting Frankenstein's monster and Dracula in Superman #344 (1980) was a pleasant surprise, with a couple of unexpected guest stars even. As a bonus, early on Superman even thinks to himself about describing "A Dark and Stormy Night".
This is one disturbing Joe Kubert cover!
Batman doesn't look like the unstoppable Dark Knight here! He's genuinely afraid for his life!
Missing yesterday couldn't be helped so to kick off the month, here's two from last month's homage to Nick Cardy that qualify for October's theme. (Images courtesy of the Grand Comics Database.)
"Dig... Dig!" *heh* The Teen Titans and their middle-aged-guy idea of teen slang.
How to Speak Hip: DIG
That's COOL.
Horror in a Romance comic.
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