Has this happened to anyone who has the iphone 4s? Is this possible?

Is it possible for my message tone to go off. But with no message there? I only have this 'Tone' for my message tone… I do not have this tone for any other apps or notifications. My iphone is all up to date… So if i don't have any other Tone for any other app or notification what can it be. And i have checked numerous times, it has only done it once and i had it for a year and a half…

What could it be? And please don't say apps cause its not. And my memory on iphone is fine. There was no message? But tone went off

Added (1). No it was not siri it was a message tone… The tweet tone. And i don't have twitter. Or that tone for anything else i checked a million times lol

Was it siri? You might have set it off by accident

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