Superhuman capabilities.

Friend - Hey is this file correctly encoded ?

Me - Hell Yes. I can decode visually from an IMAGE and make sense of underlying data encoded.

Some people think I am so awesome coder I can look at Huffman encoded result and understand if it's correct or not.

What the heck is that?

That's what you get when you open a binary file as a text file: garbage text, because the binary data doesn't match any text encoding, and isn't even remotely closed to text.

Fun fact: if you know how to do that, you can recognize some formats. For example, a JPG will start with FF (no clue how that's displayed by text editors, but it's recognizable in hexadecimal editors), while a PNG starts with 89 50 4E 47, and 50 4E 47 is an identifier which display "PNG" in ASCII.

Neat trick when you can't figure out why the file don't work (for example, coworker changed the extension without actually converting the file).