At first I thought maybe they had dumped a bucket of water out on the roof or something, and the effect of it falling had made it curl, but it's very odd.
I'll try and dig up more of these, I had a TON more but can't seem to find them

maybe saved on the laptop at home.
*Edit* Here are just a few, amazing what sweet technological advances we've made in time so that we can still-frame and even use uber-fast shutters on our cameras..
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This is a huge picture so here's direct link to it.
Okay, here's a few more, i'll try and get a gob more once I get home tonight, or atleast around time for the weekend.
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