@xinjinmeng My favorite is when a web-form accepts and escapes something in a way that gets passed through systems that just don't understand it.
For example, as a result of my desperate attempts to get my name accepted in web-forms, I've gotten mail and packages addressed to "Electric Keet _", "Electric", and my personal favorite, "Electric Keet".
@xinjinmeng Er....
That last is supposed to be "Electric Keet" but it got auto-parsed. Zero-width spaces to the rescue?