Jimmy the horse wanted a nap. His human's head was handy, so he leaned over to use her for support. The human, Lisa Brown, explains:
I was out in the fields early one morning, and Jimmy lay down to snooze, which he does often. I took my cup of coffee and went to sit with him. I was scratching and stroking him, and he began to lean on me and then pushed me gently back until I was basically his human pillow! Jimmy has a very peaceful nature, but he's also a comic genius!
-via Tastefully Offensive