Accidentally turned on Siri using an iPhone 4 (not 4S) I was using the Facebook app when it decided to freeze. Out of frustration, I clicked the home button multiple times. I got back to the homescreen with VoiceOver turned on ('Triple-click Home' was not set) and a second later, Siri loaded. I tried to take a screenshot, but Siri closed just before the 'flash' took place.

Has anyone else experienced this? Non-jail broken, iOS 5.0 on Verizon.



Update:

I have restored my phone a couple of times since this happened, mainly due to this issue: Audio output and volume controls gone after updating to iOS 5.1

So, unfortunately, any useful information contained in the crash logs has been lost.
Was it Siri or was it Voice Control?  Voice Control has been on iPhone since iOS3.

Siri on the left,Voice Control on the right.
 

You activate Voice Control by holding the Home button for a few seconds, even while the phone is locked.