I had a similar situation about 35 years ago........
Back in the late 80's I worked for a mail order company and on many weekends in the summer we did game fairs and shows.
We were at a big annual pistol shoot and I was manning the table. We had a load of various Spyderco's on the table, one was the original large Mariner. This was the old stainless handled model with a serrated G-2 blade. They were fearsomely sharp out out of the box.
One of the local genius's came along and picked it up, opened it and with a sarcastic smile on his face asked me if it was sharp.
Before I could answer he had placed his thumb on or around where the choil is, applied pressure and slid his finger towards the tip of the blade. By the time he got half way down the blade I was horrified to see the finger moving up and down as the bone scrapped along the serrations.
He bled all over the table and had to go to hospital for surgery to repair the damage.
The sort of idiot does a thing like that still fascinates me to this day.......
Kind of a long story, but this reminds me of when I was a kid, browsing our local Sports Authority, which just happened to have a handful of Spyderco knives on the end cap of an aisle. At the time, they came in re-sealable clamshell packaging, so I took one out and started looking at it.
Now, to this day, I blame it mostly on how oily the blade was, but as I released the back lock and started closing the blade, it slipped and sprung shut before I could move the tip of my index finger out of the way. I remember thinking "did that close on my finger?" as it was so sharp I didn't even feel it. I stared at my finger for a couple of seconds, thinking "something doesn't look right..." and all of a sudden it just started pouring blood all over the white linoleum floor.
I tried wiping it up really fast before anyone saw, and it just started smearing everywhere. It looks like a murder scene before I decided to give up and divert my attention to my finger.
Wrapping my finger with the remaining Kleenex I happened to have in my pocket, I walked a few aisles down to find my mom and tell her we probably needed to go. She immediately noticed something was wrong as most of the blood had drained from my face at this point. She asked "why are you so pale??", at which point I explained what had happened. She then insisted I show her where and what knife it was. I walked her over to the display, where she took the knife back out of the package, and opened the knife to look at at. I'll be darned if a chunk of my fingertip wasn't still sticking to the blade! (I took it off the blade and stuck it on my still bleeding finger).
She then insisted we head to the ER for stitches, despite my objections. We sat in a crowded ER for so long that by the time we were seen, the bleeding had all but stopped. I do remember that at least a couple of nurses kind of giggled when I explained what happened, and I sat there for 5 minutes getting a very condescending lecture by the attending physician on how to properly close a "lock back" knife. I put lock back in quotes, because despite calling his knife a lock back multiple times, he actually had what actually looked like a very nice and expensive liner lock. I'm just sitting there thinking "I know more about knives than you, accidents happen."
Anyway, I ended up leaving with a tetanus shot and a band-aid, as the chunk of skin wasn't quite big enough to stitch back on.
I still have a scar to this day, nearly 30 years later, a constant reminder that Spyderco knives are indeed "laser sharp".