"What are you drawing?" - Right before pencil hits the paper
"Did you trace this?"
People hovering as we draw. YO! YOU'RE THROWING OFF MY GROOVE!
"Why you drawing naked people?"
"Can you draw me?"
Phone ringing as we just get started on the drawing
Favorite pencil/pen dies
"Can I copy you?"
"All I can draw is stick figures." or alternatively "I can't even draw stick figures."