 The FAQ for the comp.compression newsgroup contains a challenge by Mike Goldman offering $5,000 for a program that can compress random data.Patrick Craig took up the challenge, but rather than compressing the data, he split it up into separate files all of which ended in the number "5", which was not stored as part of the file.Omitting this character allowed the resulting files (plus, in accordance with the rules, the size of the program that reassembled them) to be smaller than the original file.