"Sevviekins, speak to me," McGonagall begged.
Snape continued to sit rigidly glaring at a particularly loathsome spot on the wall. Oddly enough, the spot looked just like the rest of the wall and wasn't too sure why it had been singled out for special attention.
"Sevvie, I love you! Why are you doing this to me?" the normally dignified woman begged. Strange how love can make sensible, sane people act so oddly.
"Leave me ALONE!" Snape growled.
"Oh Sevvie, don't be so silly," McGonagall scolded, and moved to sit on the arm of his chair.
"Minnie darling," Snape began in a voice of forced calm. "GO AWAY!"