strange mode?

hey all,
i somehow got in this weird mode in blender and was wondering if anyone knows what it is or how to get out of it. it is where all the egdes are curved, for example, if i have two lines at a 45 degree angle, there is a curved line coming from one end of one line to the other end of the other line. anyone?

Umm. My best guess is you added a bezier curve or something like that. Is this in just one file or in any new blend file you load/make