Since we finished landscaping the back yard, we've been letting the cats out.
Garbanzo meows constantly in the morning to be let out. If it is a work day, we don't let him out. He can be really loud and obnoxious. Pinto just sulks.
When we do let them out, sometimes only one wants to go out. So we let that one out. A while later, the first one wants back in and the other wants to go out. They pass each other passing through the door, until the next time.