1.   His mouth twisted in a humourless smile.

2.   His mouth twisted in a sneer.

3.   His mouth twisted into a nasty snarl.

4.   His mouth twisted slightly as he found the ignition and they set off, leaving behind a trail of smoke.

5.   The wide mouth twisted in self-mockery.

6.   Guy Sterne leaned forward to drink some more coffee, his wide mouth suddenly twisting humorously.

7.   The wide mouth twisted at her appalled expression.

8.   His eyes narrowed slightly, and the wide mouth twisted in wry apology.

9.   He took a brief drink of champagne, and his mouth twisted in a humourless smile.

10.   His mouth twisted with distaste.