* "Close shave!" This is the classic punny answer, playing on the fact that barbers give shaves.
* "Whew! That was a close one!" This is a more straightforward reaction, emphasizing the near miss.
* "Better luck next time!" This could be said with a bit of humor, or with a nervous laugh.
* "I think I need a new pair of clippers." This implies the accident was due to faulty equipment.
What do you think is the funniest or most fitting answer?