What’s That No.6 Been Doing?

No.6 "This?" indicating the plaster on his forehead.
Doctor “Oh I should leave it on for a few days, just to remind you.”
“A reminder of what?”
“To take more care while shaving.”
 "I did this while shaving?"

“Yes.”

“How did I manage that?”
 "With great difficulty my dear fellow!"

BCNU