Originally Posted by HSLD

Does anybody else use the water bottle method? Hold the water bottle up at eye height and look tangent to the water. That tangent view is level. If you look tangent to the bottle and beyond and you see a tstorm above the water line, you won't top it at your current altitude.

Of course this method is for amusement only, while it works, actually using it will get you a mention in the tool of the day thread.