Well, this has happened to me more than twice already: A Reality Check telling me I'm awake while I'm in a dream.
Now I wonder if that has ever happened to you guys?
If yes, tell me how it was, an what you do to avoid it.
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Mine were:
1. Pinching nose and still being able to breathe FAILED - I could not breathe
2. Trying to make my finger go through my hand FAILED - I couldn't make it
3. Trying to breathe underwater FAILED - I couldn't breathe
4. Counting my fingers FAILED - I had 5 in both hands
out of these, only 1 and 2 made me try another kind of reality check, and therefore get me lucid