Once, i had a nightmare that i was running down a tunnel getting chased by a killer (like from a slasher movie), suddenly, i woke up, and, because im a serious horror movie fan, i wanted to get back into the dream...
This was before i knew about lucid dreaming, so all i was doing was just imaging the dream again, and i got back into it!
This is sort of boosting my confidence now, because each night i WILD and it is unsuccesful.