Mary had been being tickled for about a half hour by this point, without a break, and she still had the capacity to laugh. That girl just never seemed to get exhausted no matter how hard her poor lungs had to work. But I did have some sympathy for her, and this clip was a bit of a break. It starts with her arches being raked lightly with the bristles of one of her barettes, but then it calms down to a lot of light, raspy stroking with a stiff quill feather. She finds it ticklishly unbearable, but it produces giggles more than guffaws.