Today so far I have:

• foolishly picked a fight with the Axiom of Choice, which wiped the floor with me
• twice attempted unsuccessfully to review second drafts of things I had already reviewed the first draft of, and found that I was now too familiar with the material to do a good job any more
• been rather startled to find I can recite my bank sort code and account number from memory. If it were my credit card number I could understand, but I'm sure I don't need to give my bank details that often.

Some days, everything I do has a clear purpose and is part of a coherent whole. Today, by contrast, seems unusually disjointed.