I am humorous, friendly, curious, satirical, and trainable
Okay, in a carpenter's level there is water and a little bubble, when he puts the level on a flat surface (it is plumb), the bubble is between two lines. A half bubble off plumb means the bubble is under one of the lines.
You cannot take this literally, I'm not really a bubble or anything like that.
Books: The books my friends write
Music: Pink Floyd, AC-DC, Sting, Earl Bostic, Jimi Hendrix, Rimsky Korsikov, Katchaturian
Food: Frog's legs and alligator.