Tiltedc

Tiltedc is C but tilted.

It should be 100% C code, but the text shall be interpreted vertically, from top to bottom and left to right. It is technically a Weirdlang.

Advantages

Programming feels like a side-scroller game, this adds even more enjoyment to programming.
May use screen space more efficiently (when using a horizontal-mounted monitor).
While coding, you feel as if you were in your own little matrix, which may boosts your self-esteem.
It looks cool (could almost be used as a wallpaper).

Most modern text editors are not specialized in editing vertically.
Slower compilation (more steps inbetween, because file formats are not optimized to handle Tiltedc).
Generally, the files end up being larger to their C counterpart (the same reason as above).
The programmer has to be accustomed in reading text vertically in order to be efficient.

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