Difficulty with concentration caused by randomly occurring poignant memories? Check.
Unexpected, embarrassing crying jag? Check.
No, it's not menstrual. It's the tenth anniversary of my grandfather's death.
Oh, Grief. It's so cute the way you sneak up and bite me on the arse when I'm not looking. And by "cute" I mean "evil and underhanded". Time was supposed to help heal you, but it turns out he buggers off on holiday with no advance notice at the critical moment.