I went through all 137 issues of Superman's Girlfriend Lois Lane. Man it is one great comic for KO scenes, especially for sleeping gas and chloroform. Lois Lane was chloroformed twice, and Lois Lane personally chloroformed 3 people (including Superman, lol). Then there are the gas scenes. Man there was just so many. This is one of my favorites.
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I updated the database with 13 more gas scenes from SMGFLL.
So yeah, I have almost 500 scenes in my list. Many of them were found by other people and I generally try to credit them if I remember (it's in a screentip). What I would like to do very soon is maybe compiling a rough list of the comics we have all gone through. I know I have looked through everything in Superman's Girlfriend Lois Lane, Teen Titans v1, Super Friends, Young Avengers, Academy X, Emma Frost, West Coast Avengers, Cloak and Dagger. There might be more.
I get a surprise everyday.