Change the email address to a random uuid-like hash @example.com, then change your password to a random hash. Do not allow your browser or password manager to save these values.
Now you’ve locked yourself out with no way back in.
It's not really about keeping myself from commenting here or anything like that. There's something about the account being out there, the karma associated with it and such that nags at me a little, probably only because it's my real name and the volume of content associated with it. If I could change the username it'd bug me a lot less. I'm sure I'll come to terms with it somehow and still feel like I've successfully jacked out. Still, it seems like it'd be easy to add functionality like reddits: delete the account, keep the content, replace the username with [deleted]. [deleted123] would keep the content grouped under a single name if that's important. Maybe I'll write a letter to HN suggesting it.
Solid, but somehow very creepy, answer. I'm imagining someone discovering that they're a clone, and that their original was just sort of shut into a closet and forgotten about.
Now you’ve locked yourself out with no way back in.