Well, to share some of my favorite morbid findings:
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Melanotan is a peptide that increases skin pigmentation. Some people have tested it to the extreme, and the pictures are some combination of funny, terrifying and "at what point is this racially offensive blackface?". Also supposedly causes erections similarly to sildenafil .
https://www.reddit.com/r/WTF/comments/3gxjem/before_and_afte...
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The etizolam not wokrign meme
https://www.google.com/search?q=etizolam+not+working+reddit
Unfortunately can't find the original post, but when this benzo was easy to buy, there were frequent threads for a while from different users who were complaining that they weren't feeling the effects... often with many spelling errors that led many commenters to be pretty sure that it was working just fine and the posters are just not aware of how intoxicated they are. Became a bit of a meme.
Kind of like the 'roofie circle' Gob story arc from arrested development, it seems very common that people will take some, forget they took it once it kicks in, take more, forget, and so on. When you can order 1000 doses for the price of a paycheck, it leads to very bad outcomes. Often these stories end up with people blacking out for weeks or months at a time, destroying personal relationships, property and their careers, and only regain awareness after weeks in jail or a hospital. Pretty scary stuff.
Also, several stories from people buying time locked safes so they don't redose, blacking out, and finding their timelocked safe destroyed and empty.
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Cops arrest guy with RCs, etizolam and a mescaline derivative. Cop "accidentally" gets some on his lips (probably thought it was heroin and had a dip?) and gets sent to the infirmary tripping. Suspect is released when the substances turn out to be legal (but not for long - possibly in part because of this incident)
https://www.reddit.com/r/researchchemicals/comments/fpery3/c...
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The stories about "bath salts" pyrovalerones like aPVP and MDPV are quite insane. Extremely potent and addictive. These are like the fentanyls of the stimulant class and propel users into psychosis with relative ease. Like, compressing the effects of a 2-week meth binge into a single weekend, with all of the negatives that come along with that. I believe the report of the florida man who ate someone's face off was under the influence of one of these.
https://erowid.org/experiences/exp.php?ID=101129
http://www.orangejuiceblog.com/2011/05/man-high-on-bath-salt...
https://en.wikipedia.org/wiki/Miami_cannibal_attack