How does the automatic subjective filter work?
How does SOFU determine that "The question you're asking appears subjective and is likely to be closed."?
I'm of the understanding that it looks for a few specific keywords (like "best") in the title. Try writing a nonsense title with "best" in it and hit Tab, then go back and change "best" to "biggest".
Update: Here's the definitive answer, from Jeff: How does the automatic subjective filter work?
Not just that. It also looks for keywords like "you" For example,
returns the alert
returns the alert; while
does not return the alert