Problems can occur at any time during a presentation that involves an audience. Visual aids can get screwed up; loud sounds can interfere with the audience's understanding of your point; or you might just make a mistake in what you say or how you say it during your presentation.
The time to think of a witty line to deal with a problem in your presentation is before the problem occurs, because more than likely, you'll be too nervous at that moment. Using humor shows your audience that you're not upset and that you're still in control. Staying on your toes at all times is important, because unfortunately, lots of problems can occur when you're giving a presentation.
If you want to capture and keep the attention of your audience every time, then make sure that each presentation you make focuses on helping your audience to solve an important problem. This is critically important: if you’re not helping to solve a problem for your audience, then why are they listening to you?
In conclusion, the problem that you choose to focus on must be a real one, one that is likely going to cause pain for your audience, professionally and perhaps personally, if it is not solved. Ideally, there should be clear risks
