If you have forgotten your password you will need to complete a factory data reset:
Factory reset will permanently delete all your data and customized settings, and will remove any applications you've downloaded and installed. SD and SIM card data will not be deleted.

(ANDROID FACTORY RESET-HTC EVO 4G) http://cellphoneforums.net/google-an...ml#post1426921

(HTC Inspire)
With the phone turned off, press and hold

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You know when you download certain Apps, you enter your iTunes password, then a window appears to ask if your over or at least 17... does anyone ever say NO!

Useless, but maybe a Law suit protection step.