It is a very irresponsible question.
I had a Java interview scheduled today. I went near the office location and on the way I realized that I was not ready for the interview. The last year at my current job has been a very draining experience due to which I have been unable to polish my skills (no excuses) - which is one of the reasons I was looking for another job in the first place.
On my way to the interview I realized I had not brushed up on my skills for a long time. Previously I have been very good at giving interviews, but this time it occurred to me that it would be a disaster so I just went back home without giving the interview.
Is there anything I should do in order to avoid being blacklisted (if possible)?