A lot of those moments both in good and bad, most often when an auction i really want is ending no matter what the end result is and when a long time hunt appears on my screen. I don’t know why but on ebay auctions it sometimes wants me to confirm my bid once and sometimes twice, one time when i wasn’t familiar with this i had a card i really wanted and tried to snipe it last second only to face another confirmation request which took enough time that i wasn’t able to place a bid at all in time, not getting that card shaped one direction of my collecting entirely from that point and that really made my heart skip a beat.
The most major ones tho both in good and bad probably are the moment when i saw a person i was messaging accept my offer for the topps chrome sparkle muk, and the moment when i started reading about the truth reveal of the playtest cards.