I used to wonder if it was just my DH who would decide to put up some shelves that had needed doing for months, 15 minutes before we need to leave for somewhere, but I know I'd better let him do it or it might be months before he actually feels like doing it again, but I have heard that some other people's DPs have a habit of belatedly doing things at the worst moment as well!
DH also decided to fell a bunch of sick trees at the back of our garden when DS was a newborn. I mean, great, needed doing, but was the task over a few weeks (for an amateur) and not really an ideal activity when I had a toddler and newborn to manage.