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When you're a kid, you don't realize you're also watching your mom and dad grow up.
(self.showerthoughts)
A "Showerthought" is a simple term used to describe the thoughts that pop into your head while you're doing everyday things like taking a shower, driving, or just daydreaming. A showerthought should offer a unique perspective on an ordinary part of life.
What do you mean with the cake thing in this context?
I beleive they mean you can't expect there to be content and also expect it to be fresh and new.
I think "have your cake and eat it too" is a little ill fitting but its the general gist of wanting something and then wanting it in another way which is not compatible with the first way.