Not horse shampoo, but nearly died laughing at my OH's reaction to my suggestion that he used a touch of silver on his hair, saying it's Harleys, (cob) but I have another, he was horrified at the thought of using a horse shampoo, not realising its human shampoo for grey hair and quite expensive, I did tell him it was for people but not the price. Harley has more hair products than I have