Crystal is tied up and completely helpless! She has her feet tickled. Her ticklish toes seem to be her weak spot. Strangely the brush doesn't affect her as much as I'd hoped - although it keeps the giggles coming, however, biting the knees and elbows seem to be the worst! Nice giggles - Not horribly ticklish - Nice soles! First half is foot tickling, second half full body tickling.