Most of the time my orders are pretty planned out. I'll know what we're going to order usually order it on a Wednesday or Thursday so we can enjoy it on the weekend. (Luckily we live close to EF's warehouse so it's a one-day ship.)
But occasionally I'll see a really good deal, or we'll have an idea of what we want and if I'm bored at work I'll make an unscheduled order. I've had two of those in the last two weeks.