Started as a Night Elf Rogue back in TBC, and was under the impression the game had a linear, platform-like structure, so I ran off Teldrassil thinking it would take me to the next area and then rolled a human.
Worst one though, was shortly after LK was released, and I first got interested in raiding. I was searching for raids and got lucky one night and got into a Naxx10 alt run with the top raiding guild on my server. I was ecstatic and intimidated. We down Anub'Rekhan in one shot, then comes the part where I was completely unfamiliar with loot rules in raiding. The need/greed screen comes up and I see a pair of gloves that are a nice upgrade, so I greed them, thinking I'll just be rolling against a few others. To my horror, everybody else in the raid passed and I was immediately kicked. I promptly messaged the raid leader and apologized. A day later, I did a name change. ._.;