There's as many scripture twistings in this thread as in the watchtower rag.
The wars and natural event described in the Olivet Discourse, Mt 24, Lu 21, Mark 13 are normal things, and it was in reference to the Jews in the first century that Jesus was speaking to. The things Jesus talked about were not a "sign" but rather an 'anti-sign', things to be ignored.
The actual sign of the Son of Man is the darkening of the sky in its entirety. Literally. Black sky. As if it was "rolled up".
It's gonna get your attention like the MC turning off the lights at your wedding to get everyone to shut up.