I know the ideas behind it, of course, but specifically I was wondering about something I read the other day. It was a typical religion argument, and someone asked what came before the big bang. The answer given was something like "Time didn't exist before the Big Bang, so it's not a question that can be answered". Not verbatim, but that's the gist. So, my question should be obvious by now - how does it work? My mind is having trouble imagining a time where... well, there wasn't any time.