Take 1

Here the speaker was unprepared to handle questions from the audience.  This appears very unprofessional.

Use the player on the left to view this video. Click YouTube logo to enlarge.

Take 2

When preparing your talk, think of questions that the audience might ask and prepare a response.  Sometimes you may be caught off guard by a question.  Here the speaker demonstrates how to deal with this situation.

Use the player on the left to view this video.