Trade i did with Metamorpher back in July, when i felt going Cow-wise.
Well, Some of my potion ingredients do use milk and need to keep properly on a fridge, but when you work on so, so, so many potions i sometimes left them unattended on my fridge. When Meta told me he was thirsty and mentioned he could take a glass of milk, I did forget to mention that little details to him...
Well, at least he just take a glass... He will be a bit "Satyred" for a couple of days.