I've had several non-lucid dreams about lucid dreams. I've also spent a dream staring at my digital watch (for some GPS thing). Since looking at a digital watch was a heavily practiced RC for me (in dreams, you cannot read the figures) this annoyed me when I woke up.

Oddly enough, I've also had failed RCs. I awoke once at 2:53 pm, I believe. I stared at the time for a while checked all the digital clocks in my house, because I couldn't believe how late it was. As all the clocks were clearly displaying a consistent time, I resigned myself to getting breakfast/lunch. Then I woke up.