a day in the life
When you live someone else's life, and they're rich, famous, and happy.
My cousin lives like a king. I wish I had his life. He eats pizza for breakfast and I eat cereal.
My friend's life is so easy, it makes me want to cry. He doesn't even have to do homework.
I would trade my life for my neighbor's. He has a pool, a mansion, and a dog that knows my name.