I just designed a part in Solidworks, and converted it to an engineering drawing, submitted it to my boss for his bragging rights. It's basically a simple disc with some minor features. The drawing called out the radius of the disc as 1.00". My boss just called me and said that I didn't specify the diameter of the disc, so I should redo the drawing. I chuckled and thought about adding, "NOTE: Diameter=2R" but I didn't. I erased the Radius callout, and put in a callout for the diameter of 2.00". Supposedly, he is an engineer.
Hmmm.