Most awesome error message ever

Trying to list the contents of a keystore I got the most awesome error message ever:

$ keytool -list -keystore keystore.jks

keytool error: gnu.javax.crypto.keyring.MalformedKeyringException: incorrect magic

uh, what?

$ which keytool

/usr/bin/keytool

Also notice it has "gnu" in the class name.  The path /usr/bin wins over the later path /opt/jdk1.6.0_21/bin which is the keytool I actually wanted since I'm using Sun and not GNU.