Twombly painted Untitled (1967) in a such an unconventional way, you might see the technique make an appearance at Barnum & Bailey's.  

The artist sat on the shoulders of a (very trusting) friend and made a continuous stroke as his buddy moved him side to side, resulting in the loopy lines across the canvas. Though the painting resembles scribbles on a classroom chalkboard, that's a magician's trick of the eye, Twombly actually painted the grey background and then drew on top of it.

The meaning of the scrawling lines is anyone’s guess. Maybe it’s a warning to stay in school to avoid messy handwriting. Was Twombly traumatized by the cursive letter “e” in elementary school?  The painting must represent a recurring nightmare in which he’s forced to draw the letter in front of the whole class as they laugh at his wobbly attempts. He probably practices for years to avoid reliving the embarrassment and once he hit it big decided he might as well sell his scratch paper to a museum. Who's laughing now??