You learn something new every day...

[alexpgp]

There would appear to be a "gesture" you can make on my VAIO's mouse movement pad (grey area used to control the mouse) that causes the browser to go back a page. I have no idea what that gesture is (I'll find out soon, when I disable it), but I apparently make it from time to time. It's really useful if you want to ruin your Web-browsing experience.

Cheers...