The 10 minute black hole

There is a mysterious part of my morning routine that baffles me. There is a black hole that sucks up minutes off the clock right after I say to my kids that we are ready to go! They are dressed, have shoes on and are often headed for the door or are already out it. (Although there may be a last ditch effort to pick out a movie or toy to take to the sitters). 
I think we are on schedule when I make the "let's go" statement but when I look down at the clock in the truck as we pull out the driveway, I discover that 10 minutes disappeared and we are no longer early or on schedule but BEHIND!! How the heck did that happen?
Hmmm....pouring the cup of coffee, realizing that my computer wasn't shut down from the night before, a meeriad of other little things or is it just a black hole?
I continue to make an effort to gain just a few more minutes each day so that perhaps we can be, at least, on time when Jeremiah starts school in a few weeks!