They always say that.
"There is an asteroid heading straight for us, it\'s a big \'un too, 25 miles across etc.... 20 years down the road we predict that it will directly cross earths path, not to worry though the chances of such a thing happening are slim, in fact you have a better chance of being struck by lightening while wiping your arse on the tail fin of a Jumbo jet in mid-flight"
Sound familiar?