Stay vague, while still being on topic.  Are you doing a vampire RP?  Find your hotwords: Night, Thirst, Fang, Blood, Red, Crimson.  Then add a companion word or phrase.  Neverending Night.  Eternal Thirst.  Crimson Moon.

Got an alien RP?  Find your hotwords: Visitors, Strangers, Otherwordly, Encounter, Cosmic.  Then add a companion word or phrase.  

Ultimately, the title is just a billboard trying to bring in the initial click.  The first OOC post (that explains the whole RP) is far more important.  But that's the formula; Find your hot words, add a companion word or phrase.