When I was younger and didnt know about my limits, specially when it comes to hard stuff, 2 or 3 times, i forgot some memories. But normally not complete, its more about specific actions. So the first time I drank too much, I dont remember my sister made some photos, with me sitting on the toilette and posing as liberty statue with a toilette brush, and I dont remeber any of this. While on the other side, when I watched around a year later the film "The Bruce Lee Story" I was triggered by the beginning with the statues until my sister told me, that I watched this film with her afterwards the photoshooting, but she thought that I was sleeping then already. O_o
I also have memory leaks from an festival evening, but I only drank two beers (with the age of 30, so two beers never can make me that drunk) and because of me standing alone for a while, while our friends were searching friends of them and so on, not watching for my beer that stood on a party table, I think I got some KO medicaments in it by someone. So about 30 minutes afterwards I dont have any memory. So my memory ends with my friends returning back to the stage, where I waited and then we listened together to the concert. So I got told by my friends, that we left the festivals afterwards with their friends, and went by foot to one of our friends homes. I cant remember it, but according to my friends I was still actin normal then and we also were going through some woods, without problems. At the friends flat I went from talking to awkward to poorly responding and acting as if I was heavily drunk within 10 minutes, and my partner and I also slept there on the couch, because elseway he would have been forced to carry me nearly couscoiousless.
The bad thing is, that without myself and my partner knowing, that I only drank two beers, it would have seemed for me, as I drank too much and had a "normal" memory loss.
So beware of hard stuff and always keep an eye on your glass, if you dont like memory leaks.