Mendalism is defined by some as "fixing" another's work of art without permission.
The word originates with a modification of the word "vandalism", substituting the first part of the word with "mend" as in "to repair".
Here is an example of mendalism at its worst:
As the above embedded video is likely blocked, please view it here directly:
http://vimeo.com/48061370 The following example is a more harmless case of mendalism:
In both cases the intent was pure, but the two separate outcomes vary widely.