The answer to "why" at our house right now is, "Cuz want to."
When she is the one asking why, each time I try to respond with a reasonable and logical answer only to be faced with another "why." Finally, I end with "Cuz want to," and the conversation ends with "Oooh."
So, when faced with this "why" question, my impulsive response can be found above--"Cuz want to."
I actually looked forward to doing this challenge this year. I enjoyed it a lot last year, so I thought it would be fun to do it again. Next year, before I begin, I will edit some of the questions similarly to how I've been doing it as I go along this year.