I recently got this message when trying to post a question:
Oops! Your question couldn't be submitted because:
Your post appears to contain code that is not properly formatted as code.
Although I agree that the automatic detection mechanism at work here serves a useful purpose, sometimes it creates a real usability problem. I'm not the first person that this has tripped up.
There are two good options for improving the experience:
1. Add the first occurrence of the offending code to the tooltip (fairly easy)
2. Highlight the line and character position of the offending code in the edit window (not as easy)
These are much better alternatives than, say:
3. Changing the message to a warning rather than an error (bad)
4. Automagically changing the offending content to code (usually wrong and counter-productive)
There may be other options, but those are my top four.