carbheaton,
and in my opinion, preparing for the possibility ensures that it will happen.
I suspect that largely mis-adventure befalls the ignorant. If I believe it is easy to miss assumptions, make a bad decision and end up in IMC as one of the possible outcomes, then surely I am more likely to look for reasons why it might happen and better prepared to plan to avoid.
However, one of the sensible thoughts I would have is, what should I do if I enter IMC. Here is an example where the weather forecast was for VFR, but it wasn't to be so, and there was no way out for the helpless pilot:
http://news.bbc.co.uk/1/hi/england/o...re/4906670.stm