Cupboard

Now that's a specification.

I was browsing the Javadoc for JSR 166 (Doug Lea's excellent util.concurrent package, slated for Java 1.5), when I encountered this wry caveat in the documentation for the new System.nanoTime() method:

Differences in successive calls that span greater than approximately 292 years (2⁶³ nanoseconds) will not accurately compute elapsed time due to numerical overflow.

You have been warned.