I would love it if Canon would make a locking switch or cover for that wheel.
it would definitely help me out. it has happened before, the first time I didn't notice it for quite a while this time it only took about 2 shots LOL.
I believe it happens when I have the camera just hanging from my shoulder and I am walking, as the camera back rubs against me it can catch the mode dial and presto... I frame a shot and the fhash pops up! now that would be embarassing! 

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