chaos

MT: Replace a semicolon (;) with a greek question mark (;) in your friend's C# code and watch them pull their hair out over the syntax error

— Peter Ritchie (@peterritchie) November 16, 2014

chaos is a pastejacking tool which modifies text copied to the operating system clipboard. The idea is to replace the ASCII character semicolon (;) with an identical looking Unicode character Greek question mark (;) as soon as any text is copied to the clipboard, so that when a user tries to compile some copied code, their life becomes harder.