What is a good answer, during an interview, when they ask "Tell me something bad about yourself."???

Say you do something good too much. Like say "I care too much", or "I work too hard".

I think a good answer to this is something that could be both good and bad. Like:

I'm a perfectionist

or

I work very quickly

Do you get the idea? Just be prepared to mention why this might be a bad quality but that you realize the potential for problems and that you know how to turn it around into something good.

Try: 'Yeah, I get easily irritated when I'm asked to think negatively about myself, but I'm working on it.'

Seriously though, think of a negative but turn it into a positive, such as 'I tend to pay too much attention to other people's problems, BUT I've learned to direct them to someone more appropriate to help them so I can meet my own deadlines.'

I usually say......"I set high goals for myself that are usually more than my employer is looking for, therefore, if I don't meet the target goal I've set, I come down harder on myself than employer would".

You can't let a task go until you are totally satisfied with it.

I work to hard

say that you like your job too much and that you work to needlesly