Never ever ever ever give money to someone that promise to give it after to charity. There are countless stories with proof of people who never kept the promises. Even if they did give it, they get tax benefit instead of you. It’s worth also (even more) for shop or other places that propose to round up the total and give to charity.
You want to give to charity? Just give to charity, why a middle man ?
You want a slug-related traumatizing story ? I had a cat with very long hairs, there was a cat door to the garden outside but usually he slept inside. One morning i wake up and feel the cat close to me in the bed, something very common. I start to pet him on the dark being half awake only. After some time i feel something wet in his belly fur, but as I’m half sleepy I don’t react and keep petting him. Only after what was probably a long time, I realized that something is wrong, turn on the light and see a slug curled/trapped inside his fur, I was touching it with my hand for several minutes!