There are so many mobile sites that have broken scrolling until the entire page is loaded, I almost invariably think Chrome crashed or something until I realise that it's some news site (it is always news websites that have this issue) and its JS.

Even funner are pages where scrolling stops working entirely when the page is fully loaded. As in, I can no longer read the article or zoom. So I have to refresh the page and hit the "stop" button before it finishes loading too much (but enough to have the text on the screen).