Thanks for the link, bealine, although the article was dated in 2012. Still proves that the bluey things sometimes arrive unannounced on people's homes, gardens, etc., with only a loud boom when they hit. A couple of kilos wouldn't be enough to go through someone's roof, but the one's we've seen on the TV here in the past sure made large holes when going through those roofs.
So, in theory anyway, our inbound flight to YYZ to pick us up for our flight back to LHR, arriving on a very cold, snowy day two weeks ago, after having flown for some distance with the freezing temperatures at high altitude, MAY have indeed landed with possibly frozen lav tanks or the drainage piping.
bj-21.