Anne Wheaton, the wife of celebrity geek and Star Trek: The Next Generation star Wil Wheaton, writes:
Wil was asked to sign the yearbook of a boy who just graduated from high school. He added a little extra something.
All of this is good advice to high school graduates. I would also suggest not attempting to perform a Kolvoord Starburst unless you're a master pilot.
(not a big Wil Wheaton fan, if it's not clear)