Originally posted by rexle
My dog is purple, but that doesn't strike me as unusual
Of course not, your from california!
j/k

It sounds as if in that dream you didnt have the slightest suspicion that you were dreaming and instead your dream self was convinced that you were awake. Thus when you tried to demonstrate a reality check you influenced the outcome by your reflexive conviction that the test would fail. In a way it worked perfectly because your mind manifested the outcome that it expected and desired.
So dont let that one instance discourage you.