I've donated once a 1000 Token Coin instead to put it into my vault. The next three days I maked wizard quests like a stupid, to get back that amount of tokens.
Yeah, the rollback was very stupid, but it wasn't bad for me, because I didn't do much before the rollback. XD

Hmm, nothing terrible has happened to me on subeta so far.. I hate it when I miss out on cheap items right before they inflate and stuff like that though :P
rollbacks eating thousands of items worth millions of sp's
[Item=Smiley Fish][Item=Love and Peace][Item=Smiley Fish]
He also Said: I have a mind to join a club and beat you over the head with it.
Not submiting a single damn book for the last Reading Drive. I had just joined up and didn't think it was worth it....god, do I regret that choice now. However, it has prompted me to stockpile a whole crapload of books for the next Drive, so something good did come out of me being cheap. XD
that one rollback right after the restock war. i lost a ton of things because i put them in my shop (and i decided to make a gallery and move stuff there). along with a spectrum potion i got from the token shop. i accidentally put it in my shop instead of my vault, but i was too lazy to to move it. and yeah, i still regret not moving it -___-
Some days ago I got a Lizard Minion Event... and of course I was at the Atebus zapper and had my Trap and Spray in the Vault... yeah that was like a kick in the ass Dx
The rollback was not that bad for me, luckyly I did not made much before it came so I haven#t lost anything, maybe 300k or so, but nothing important :o
I don't really have one... unless you count a bad day as being one with no luck on quests what so ever. Then yeah I have had a few days like that.
The worst thing that's happened to me is not winning the bucket at the polar ice fields even though I've been trying multiple times a day since the ice fields came out. x.x
When I went on hiatus for more than a year and found that all the clothes in my wardrobe had gone to the land in the sky. ...although that was probably a good thing in retrospect, given my fashion sense back then.
We move against the tide.
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The recent rollback was pretty bad, but I think I got everything back/did everything that I needed to.
I stocked a certain user's stocking with my 10 Percent Discount Card during Luminaire. I logged a ticket about it, but before the UA/A replied, I decided that it wasn't very nice to take a gift back. So, I told the user about my mistake, but that I wanted them to keep it. I still see them around from time to time, but I don't think they remember me. We've both ISS'd since then. :P
Edited for clarity.
Accidentally morphing a nightmare antlephore that I was about to give to a new owner into a dusk keeto or somethin'.
Accidentally zapping a nightmare devonti.
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Other event-specific user interactions
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it was probably when i first registered with the site...i wanted a specific username, one that i've been using for many years, but the site was so glitchy it took me 2 whole days to complete registration and by that time all the names i'd entered (including the one i really wanted) had either been turned down because someone was already using it or i'd get an error message...in the end i was just sticking any old word at the end of moonie and throwing it in in the hope that it would accept it and finally it did and yippee...i was stuck with a hyphenated name i didn't want...to add insult to injury, by the time i got onto the site i found that the original name i'd wanted was still available...what a kick in the teeth...!! D:
the wonderful site made the crappy name issue pale into insignificance tho...i came to terms with the fact that a name is just a name and there are much worse things that could have happened...
i'd still change it in a heartbeat if i could tho... :P
laughs
when i mispriced an item at 3.7m instead of 37m. lol :B
the day before the lizard archievement was released i forgot to take my trap out of my vault, and the day afterwards, when it was released i got on the homepage a event for a 3.5 mil item and i noticed i forgot my trap

When I had made a new shop to sell all my expensive stuff in over 40 mil in items The the shops rolled back and I lost it all because it was shown being taken out of my main shop but then the new shop had rolled back into my old gallery
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I had completely forgot about the things lost in rollback. But there are 2 things that I will never forget. Donating my trap and spray not once but twice. I know briliiant move. The most aggravating was donating shinwa soaps to beastie because I had just come back from a hiatus and didn't know they had been changed to stat increasers and actually worth something. I had bought up a lot of them when they were worthless and it never occured to me to check the value of them. I check prices now when beastie asks for something.