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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. The best ones are thoughts that many people can relate to and they find something funny or interesting in regular stuff.
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.