Trickster, Jokester, same thing. My brother is excellent at that sort of things.

But it sounds like a not unacceptable creation story, no better or worse than the truth. Although I'd have to wonder, if it really was the Creator, then wouldn't He know already that you're going to drop the sandwich, after all, having met you He'd have to have already discerned that you were from the future that sandwich evolved into.

Doesn't seem like much of an accident to me, I shouldn't blame yourself for it. It's just the kind of practical joke my Father would play on someone. Worked on me.