31.   Earlier this summer, the Back Bay project appeared close to dead after authority chairman James J. Kerasiotes and Mayor Thomas M. Menino butted heads over it.

32.   Even the golfers at the top of the leaderboard walked off the course shaking their heads over the way the recent weather made the greens so unpredictable.

33.   Every now and then, the members of a friendly chorus of Greek peasants pop their heads over the walls to echo her.

34.   Evidently, Steel and members of the consortium butted heads over programming.

35.   Federal Circuit watchers are scratching their heads over a bizarre incident in which portraits of two deceased Federal Circuit judges were slashed by an unknown vandal.

36.   Future geologists may be scratching their heads over opaque, milky-white Coca-Cola bottles, fossilised within the rocks.

37.   He stood in front of the microphones, and in his aw-shucks way, scratched his head over what Pippen had ever done to deserve such coddling.

38.   How many people still shake their heads over the nomination last year of Meryl Streep?

39.   In their analysis, Pappas and Voran slide a minute disk-drive head over the surface of an audiotape.

40.   In the end, viewers could only shake their heads over their willingness to be suckered, once again, by the entertainment industry.