11.   And the actor does exactly that, rapping his knuckles on a wooden desk.

12.   As she spoke, she rapped her knuckles on her large wooden desk.

13.   Mothers rapped knuckles otherwise.

14.   This is about a culture in which we think we can snatch the cheese before our knuckles are rapped.

15.   To the same question, Mrs. Clinton answered with a story about her third-grade teacher who had a penchant for rapping the knuckles of naughty students.

16.   Stockholm also had its knuckles rapped for organizing special social events for the spouses of IOC members in Lausanne.