A job interview.

I am a recent graduate so I have some interviews during this month. One of the most hilarious questions that I came across and the answer that I gave them is was this:
Interviewer: Can you keep a secret?
Me: Yes, I can.
Interviewer: What secrets have you been keeping?
Me: Sorry, I cannot tell you. It is a secret. (or: They're a secret. because he asked what "secrets", more than one "secret").

You're very clever, haha. The corrections I gave are very, very minor - I barely noticed them at first.

A job interview.

I am a recent graduate so I have some interviews during this month. One of the hilarious questions that I came across and the answer that I gave them is this:
Interviewer: Can you keep a secret?
Me: Yes, I can.
Interviewer: What secrets have you been keeping?
Me: Sorry, I cannot tell you. It is a secret.

I find that sentence odd.  I understand it completely, but I'm being picky.

"[One of the hilarious questions that I came across and the answer that I gave them] is this:"

The bracketed phrase is a conjunction of two singular nouns, but is then treated as a singular.  I'd try to avoid conjoining them and say something like this:

"Here's one of the hilarious questions that I came across and the answer that I gave them:"

Otherwise, perfect. :)  I disagree with the previous poster saying that "It is a secret" is an error.  By saying "It is a secret" you mean that you're keeping only one secret, so it's acceptable.

A job interview.

I am a recent graduate so I have some interviews during this month. One of the hilarious questions that I came across, and the answer that I gave them/the interviewer (not them, the subject is 'question' not the questioner) is this are/were: (question + answer = two things)
Interviewer: Can you keep a secret?
Me: Yes, I can.
Interviewer: What secrets have you been keeping?
Me: Sorry, I cannot tell you. It is a secret.

A job interview.

I am a recent graduate so I have had some interviews during this month. One of the most hilarious questions that I came across and the answer that I gave them is this:
Interviewer: Can you keep a secret?
Me: Yes, I can.
Interviewer: What secrets have you been keeping?
Me: Sorry, I cannot tell you. It is a secret.

Humorous.