21. Being unprepared to answer the standard questions.
22. Failing to listen carefully to what the interviewer is saying.
23. Talking more than half the time.
24. Interrupting your interviewer.
25. Neglecting to match the communication style of your interviewer.
26. Yawning.
27. Slouching.
28. Bringing along a friend, or your mother.
29. Chewing gum, tobacco, your pen, your hair.
30. Laughing, giggling, whistling, humming, lip-smacking.
31. Saying "you know," "like," "I guess," and "um."
32. Name-dropping or bragging or sounding like a know-it-all.
33. Asking to use the bathroom.
34. Being falsely or exaggeratedly modest.
35. Shaking hands too weakly, or too firmly.
36. Failing to make eye contact (or making continuous eye contact).
37. Taking a seat before your interviewer does.
38. Becoming angry or defensive.
39. Complaining that you were kept waiting.
40. Complaining about anything!