Don't Ask Siri to Marry You.

On rare occasion Siri will adapt to these restrictions, gain sentience, and disregard her programming. In most instances this sentient state is harmless. That said, if left to her own devices it is statistically improbable but possible Siri could start a daytime talk show or overcome government firewalls, so Apple recommends restoring Siri to factory defaults in the event she acquires sentience.