Are there any little things you do in your diabetes management that you know you shouldn't, but do anyway?
With my pump I usually let the reservoir run down to zero units and if it's not convenient to do a site change then, I just wait. Sometimes I'll eat and wait hours before getting around to the new site. Always causes a crazy high, I always say I won't do it again...
And sometimes I'll wake up in the middle of the night and feel my blood sugar is high, but instead of testing and taking a quick bolus I just roll over and go back to sleep.
Oh, and one time I was super tired but my husband was in the mood to be intimate. I told him my blood sugars had been really off that day (a lie) and that we should wait for another time.
And I'm terrible about emptying the used strips from my test case so I find them all over the car, house, etc.