I did a fairly innocuous image search on Google and clicked on an image that seemed more *ahem* interesting than the others. Straightaway two new tabs opened and a dialog box saying "you have been invited..blah blah...for more information tap OK". Needless to say there was only one option which was "OK".
So I really wanted to close all that stuff, but I really didn't want to tap OK.
Unfortunately with the dialog box open I couldn't find a way of closing Chrome without it returning to the same state.
In the end I uninstalled Chrome and reinstalled. Was this my only option?
iPad 2, ios 7.