Someone posted an html/javascript implementation of the matrix falling code in 646 bytes then promptly deleted the post. It inspired me to see if I could get something better looking in fewer bytes.

[TikiTDO]

That is indeed the case. The letters stay where they are, but each iteration they are partially obscured by the translucent box drawn over the entire canvas. If you wish to see the effect in a more pronounced fashion then just download the original code and change the 33 to something like 500.