You probably had heard of it but i just want to share the mysterious and dark realm of music for those who don't know.
The Beatles 'revolution 9' is just witty and creepy when it played backward if you unaware. Yeah its obviously intentional so have a listen....
Now, Led Zeppelin are just pure genius because the song "Stairway to Heaven" got two different meaning depending on if it play forward or backward. Good, evil, you know what i mean.
There are more in the youtube, do some research you will be amaze of the reality....
Hehehe....this one is also genius..hahaha ok laaa:
I don't know if this is true but i heard from a source stated that our mind play our memory backward when we are sleeping hence the subliminal message effect us indirectly in a way.....hahahahhaha..just a theory xP