When NASA first started sending up astronauts, they quickly discovered that
ballpoint pens would not work in zero gravity. To combat the problem, NASA
scientists spent a decade and $12 billion to develop a pen that writes in zero
gravity, upside down, underwater, on almost any surface including glass and at
temperatures ranging from below freezing to 300 C.

The Russians used a pencil.

~~~

When Bruce Banner gets mad, he turns into the Hulk.  When the Hulk gets mad,
he turns into Chuck Norris.