Every morning when I get up, I saunter into the kitchen to get a glass of water and renew the cat food. My male cat, who is always in bed with me, knows this routine and comes with me. Except that when I get to the bedroom doorway, he runs between me and the door jamb. My beloved Britta used to do the same thing, but she was never under my feet as much as this guy is.
This attempt at tripping me up occurs on a regular basis, not just as part of the morning routine.
This morning I was sufficiently awake enough to try a little test. As I approached the door, I saw him coming up behind me. I stopped. He stopped. I stepped through the doorway slowly enough so as not to arouse him. As I walked down the hall, he walked behind (and to the left of) me. The bifold door to the linen closet was open, jutting out in the hallway on my right. Just as I reached the linen closet, he switched sides and zipped between the door and me. The little shit actually changed sides so he could cause the maximum interference!