My horse is in individual turnout with an electric rope. For some daft reason, I went through a phase of opening the rope and leaving it on the ground, instead of ducking under it when I entered the field. She's docile and quiet, either walks up to you or waits for you to get to her. But there was the day she was at the far end of the field. I was hiking across the mud to fetch her, and she raised her head and sprang into a canter straight towards the gate. I said, "Whoa! Whoa!" (among other things the swear word filter won't let me post) and had visions of her being loose and causing havoc in the yard. She cantered past me and when she got to the wide open gate, freedom beckoning, she turned in a beautifully balanced half-circle and then trotted up to me. I swore she was grinning. "Hey, I got the human to jump up and down and swear a lot!"
Yeah, they have a sense of humour.