Oh, a good few. I had two or three on my list of possible usernames that were taken by accounts with zero posts. =(
Oh god, it's the best. Sure, it might not really be able to compare to games nowadays in terms of graphics or gameplay, but for its time it was definitely a beast of a game. Hell, it's still pretty damn awesome, and I'd definitely recommend it!
I changed it because I had Bloodex (or some variation of it) for about 5 years. I wanted something new, and for a while, too, honestly. =P I changed it to Vertigo on a whim, though. Honestly, I'd spent a lot of time thinking of a good new username, and came up with a few. The good ones were taken though. And then I remembered a random memory of me playing Resident Evil 4 and fighting a boss in that game called "the right hand". Back when I first played it, I remember someone telling me that the boss was known as Vertigo, something I figured out recently was never official. That memory popped back when I was looking for a new username, and viola. I just found myself a sexy username. =D