From David Flanagan, author of the Java in a Nutshell series:

The other day I tried to come up with a Java hexadecimal literal that was cooler (and less tainted by sexism) than the ubiquitous 0xCAFEBABE. 0xCAFED00D is misspelled, and 0xDEADBEEF is not suitable for vegetarians...

My favorites?

I thought it was pretty cool that pair BADE and ACCEDED were both legal hexadecimal literals

Neat. Check out the regexp, especially if you have a list of words on your box somewhere...

Previously: Me and My Love/Hate Relationship With Java