The sheer impact combined with the fact that even if the fall does not actually kill you, you would almost certainly drown before even regaining consciousness. Once you land in the ocean, I imagine your chances of making it to land are slim to none.
You might even die from hypothermia. The water in the bay is COLD (that's why the Bay Area has such nice weather).
i think out of all the people that have jumped only one or two survived. you basically have to go in totally vertical, feet first. almost everyone doesn’t.