From Miss Squeaky's Lexicon of Idioms
Go Down the Rabbit Hole
Originally meant: To enter a bizarre or complex journey.
Modern reality:

“I just wanted to look up one word on Etymonline. Next thing I knew, I had 37 tabs open, I knew the ancient root of kneecap, and was considering a minor in Old Norse.”

By the time I emerged, my tea was cold, my parrot had learned Latin, and I no longer remembered what I was doing in the first place.
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