Be sure you go outside the Basic Multilingual Plane. A lot of software runs into weird bugs when you use characters that can't be represented in 16 bits in UTF-16. Bonus points if it uses bidirectional control characters.

You might as well add a few 'drop table;'s in there, just in case. That way, if/when your potential employers accidentally wipe the databases at Facebook (or wherever they happen to be invading your privacy), they'll have two lawsuits on their hands!

(The first being the one you file for an invasion of privacy, of course).