I believe in co-incidence but i also understand that in some situations that co-incidence goes out the window. I guess it is up to each individual to decide for themselves what is and what isn"t co-incidence.

I looked up at the night sky after taking DMt and i have never seen the stars in such detail before. It was like one of those clear, astronomy photos that you sometimes used to get on The Sky at Night.
In all seriousness i think your WTF cloud perception moment will probably stay with you for the rest of your life and perhaps that makes it more real than other memories that may fade over time.

i was watching men stare at goats last night and the bit with george clooney cloudbursting made me think of this thread http://www.youtube.com/watch?v=jjs8SDCyKiI

i'm sure ive read that shamans have claimed to have changed the weather whilst on ayahuasca but how true i know not. i like those kind of shaped clouds, you don't see them too often. it probably wasn't you but id never rule it out either.