Continuing on GIFs:
LZW by design restricts any possibilities of breaking images.
In brief, what LZW is?
Imagine that you start numbering every pair of values, like, "Co" makes pair No. 1, "on" makes pair No. 2. You number them further, later you meet the pair you already numbered, like "ti" in "possibilities", so you decide to make a pair No. XX, consisting of "ti" and "e". And so on, and so on. Later you just write down numbers of pairs instead of writing down contents of the pairs.
You can't suddenly make a pair No. 5 after a pair No. 3. You must define pair previous pair, pair No. 4 first.
That's how it works in GIF.
And then you copypaste gibber in the file. Will it work? Most possibly, no, it can have numbers of pairs which were to be defined further, but you put them earlier than they could appear, and decoder just refuses to decode the file. Therefore, making "glitch art" from GIFs is inherently difficult.Hope somebody sees the message in the systemkontra'd thread.