Funny, I use this myself, particularly in HN. I think there is a corollary though, which goes something like "Headlines which ask a question are more likely to

Funny, I use this myself, particularly in HN. I think there is a corollary though, which goes something like "Headlines which ask a question are more likely to attract attention when the subject is of interest to the reader." or "Headlines which leave an unclosed loop cause an impulse to find the solution."