I read the profile of Joseph Conrad in 'Written Lives' this morning. According to Marias:
Conrad was so irritable that whenever he dropped his pen, instead of picking it up at once and carrying on writing, he would spend several minutes drumming his fingers on the desk as if bemoaning what had occurred.
As Paul can testify, this is exactly my response to any setbacks in configuring computer systems and goes some way to explain why upgrades in which I am involved take so long. Must do better.