My cat was asleep on my lap as I was sat watching TV one evening. I started to drift off as well...
...then all of a sudden he used my balls as a trampoline and jumped head first into the closed kitchen door.
I screamed due to the immense ball pain, he bounced off the door, rolled several times on the floor, came to rest on the other side of the room, paused for a few seconds looking around as if he'd lost something and then just started cleaning himself.
He was probably embarrassed at failing at his plan to enter the kitchen through the door. My cats always clean themselves when they make mistakes as if they're pretending it didn't happen lmao
So between cats when showing aggression they'll block other cats from approaching or passing. When you open the door for a cat and stand in front of the door they interrupt that as you don't want them to come in. Just step way to the side or walk into the room and they'll follow you in.
