A behavior in a similar vein that I see on Twitter a <i>lot</i>:<p><pre><code>  some_twitter_person: I went to the park tday.
  some_twitter_person: In the last tweet, I meant "today" and not "tday."
</code></pre>
Unnecessary overcorrection. I've seen it on HN a lot too. It's as if making a mere typo will make everyone think they're an uneducated idiot.