You’ll know it has when your friend tells you about a dream he had in which he was falling, you ask him if he was kicked and he immediately knows what you mean.
If you haven’t seen Inception, you need to go see it twice. Personally I’m surprised at Hollywood to have taken the gamble on distributing a movie not made for dumb people. If you’re dumb, seriously, don’t watch this cuz your head will explode if you don’t pass out first.
Not only is this a must-see in the theatre, it’s a must-own on bluray. If you didn’t like this movie, you’re dumb. Scientifically and factually, you’re dumb.