Description:
------------
Double mysql calls or file system calls by using an image tag set to 
equal nothing denoted by 2 single quotes. Potential security risk as 
well, I have not tested for it but in theory you should be able to write 
the code on a form and have the server double all calls made on any page 
that reproduces that syntax.

Reproduce code:
---------------
Here is the code with explanation, about 10 lines.
http://w2r.com/bugs/

Expected result:
----------------
You would expect the output to append some text to the file 1 time.

Actual result:
--------------
If you run this code you'll get double the data you would expect.