great ideas just can't get them down in writing

why is it that I can write great posts in my head but as soon as I sit down to type them onto here they disappear or appear 'clunky'?  I've written the post 3 times now so have decided that this is it.  We had a really great trip out last night to see Henry Blowfeld and it was almost as though life was normal.  Went for a meal beforehand, sat through the show laughing at all the right times (that's both of us as, this being about cricket, I had no idea what he was talking about much of the time) and generally having a good night.  This was the 2nd night out in 3 days and both times no stress before, during or after.  Long may it continue.