[Angostura]

If you want a simpler example - try asking it for a list of english words where the letter V is silent.

On the other hand, I do find it quite useful for suggesting improvements to things. You can't rely on the suggestions, but they can be thought provoking.

[joshschreuder]

One of the words it gave me was “Yclept (archaic form of "called" or "named")” which is both silent and invisible!