Funny Question:

Generally funny interview questions are not so much prominent as the situational, behavioral or direct questions but it is always a good practice to be prepared. Try to have a calm and relaxed head; don’t get nervous because you are expecting different set of questions. These questions are much easier to answer but they catch you off guard. Try to develop sense of humor if you have it less.

There are technical and other types of questions in this website which might help you a lot with your preparation.
The best answer for these questions depends upon your creativity. Have out of box answers and never forget that you are still in an interview.