Why does pouring beer onto the sides of the glass prevent it from foaming, as opposed to pouring it straight down the middle?

Question

Why does pouring beer onto the sides of the glass prevent it from foaming, as opposed to pouring it straight down the middle?

In: 83

Answer 1

When you pee and hit the water it splashes and makes foam. When you pee on the side it slides the toilet and foam less.