I was thinking about comments and how I effectively use micro.blog as a commenting system; I receive m.b replies via webmention but they include the @mention at the start of the text.
I thought about hooking in to comment_post() to strip the @mention from the front of the comment as it is submitted but this would leave a before and after situation. Instead, I decided to achieve the same thing nondestructively by checking for it at display time. Now my comment parser checks if the comment text starts with a link from micro.blog and strips it out for display purposes.
See this post for an example.
I've often thought about this and found it to be a little jarring when viewing the comments in the context of the blog. As it's nondestructive I can always reverse the change if I find the flow of comments stop making sense but I prefer them this way.