I don't think I'd be willing to shout out loud when I perform reality checks, but this topic really made me think. If anyone has a friend after the same thing, just casually saying something to each other that tells you to RC -- trigger or otherwise -- would be great. Eventually, if this person was in a dream, you or he/she would mention said thing (as eventually I suppose it'd be habit to associate the person's appearance with RCing), and you'd discover that you were dreaming. I'd probably feel guilty if I didn't hang with this DC after he/she made me lucid, but then again I shouldn't need to feel that way if it's not the actual person (I wouldn't mention the abandonment to the real-life friend though ).

Thanks a lot for the idea, I should try this with a friend who took a psychology class in school.