What's Something You Believed In A Movie That Turned Out To Be Fake?
FYI: Zac Efron was NOT the one singing in High School Musical.
Movies are great. Movies are love. Movies are life. But movies can also be deceiving liars sometimes.

Oxygen
For instance, it took me a good 10 years before I found out that Sister Mary Robert from Sister Act 2 was basically played by TWO different people.

Buena Vista Pictures
Wendy Makkena played the actual character, but the singing voice was provided by Andrea Robinson.
Perhaps you watched The Princess Diaries as a kid and was convinced that Genovia was a real country.

Disney
Unfortunately it's not. Bamboozled!
Or maybe The Parent Trap deceived you, and you learned the sad truth that Lindsay Lohan does not actually have a twin.

Disney
I trusted you, Disney.