"Mooooom, we're out of milk, and I want CEREAL!!!"
"Alright, so I have everything for dinner, but it looks like we're a little low on butter, so I can't make the cake like I wanted to :/"
Now add that you have kids to the scenario, and you've got to drag them along to what should be a 3 minute shopping trip.
There are a lot of situations where taking that long for something is pretty unacceptable.