[dubcanada]

How are you scrolling right?

[Robadob]

Middle click generally gives you a cursor which you can drag to scroll in any direction, not sure if it's limited to chrome.

[LukeB_UK]

Drag over some text to highlight it, dragging your mouse all the way to the right of your monitor.

[mod]

I do it accidentally all the time when I multi-touch on my trackpad.