1: Misspelling a name

2: Mispronouncing a name

3: Commenting on a personal/family photo

4: Asking about pregnancy

5: Asking about unseen/absent spouse

6: Referring improperly to your boss

7: Failing to reset a voicemail greeting or e-mail autoreply

8: Leaving a departed employee in voicemail / on the Web

9:  Correcting the boss

10: Displaying disunity in public

via techrepublic