Idiomatic expression; English.

Definition: When someone says something and once it's heard, it breaks your preconceived notion - e.g. you can never "unsee" or "unthink" it. When someone "smashes the mirror" you can see something for what it is or think about something in a new way counterintuitive to the previous way of thinking.
1. In HIMYM Ted meets a previous ex-girlfriend who talked so much, she ended up with a deaf husband. He then signed, 'Boy, she sure does talk a lot, doesn't she?' Thus you smash the mirror.

2. "Have you ever noticed the negative space in FEDEX makes an arrow?"
"Dude you just smashed the mirror for me."
by kayleefirefly February 23, 2015
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