What is the sign that Jesus tells us to look for?

There are many who have tried and failed to predict when Jesus will return.  I find that kind of funny because Jesus Himself tells us of a sign to look for that can't be missed.

Jesus tells us "there will be wars and rumors of wars.  See that you are not troubled".  I believe He is telling us here that there will be many things that look like the beginning of the end, but aren't.  Jesus is saying don't sweat the small stuff. 

And then Jesus gives us the sign to look for.  Here is the one sign that Jesus says will be the key.

Matthew 24:15(NKJV)

“Therefore when you see the ‘abomination of desolation,’  spoken of by Daniel the prophet, standing in the holy place” (whoever reads, let him understand), 

Doesn't get much simpler than that does it?