Why did the man throw the butter out the window?

The man threw the butter out of the window because he wanted to see butterflies.

It is a joke that a man threw butter out of the window. The original sentence is why TOM threw butter out of the window because he wanted to see butterflies (butterfly=butterfly=butter is flying).

Butter is a solid fat processed from milk. It is the product of stirring fresh milk and filtering out part of the water from the thick object in the upper layer.