IN 1987, the sp 500 fell 10% in sept, made a classic double bottom after a quick 2 day rally off the first low, then ran back to the previous highs before the crash. But that last rally was 2 big up days, once big down day, etc into the top. This rally is not like that, so not expecting a crash, but possibly THE TOP
Remember, in 2000 and 2007, you could have held long until 3 months after the top when the sp 500 got back to just 5% below it top before the real drops happened.
bottom line: Way too early to say a bear is about to begin, but just might be the start after this currrent rally ends.