If simply popping into the command line isn't enough to make you feel like a '90s hacker, GitHub user bartobri created a neat decryption text effect pulled from the movie Sneakers.
Once you install the tools, you can manually run any command you want through the decryption effect. You can also just type
sneakers into the Terminal for an exact reproduction of the movie scene.
Silly? Sure, but we could all use a cool decryption animation in Terminal every once in a while. You'll find install guides for a variety of different operating systems over on GitHub.