Brad has given advice that I would struggle to improve upon.
Think about the person you'd want to back away from at a party. What should he/she be doing differently to be more engaging and/or appealing?
What makes a person dull? A lack of imagination in conversation? Apparent lack of care as to what the listener feels is important to them?
What makes a person a turnoff? Insensitivity to the listener on a personal level? Rambling, straying from the subject, pontificating, forcing the subject, declaring themselves the only true or valid authority? Mumbling? Failure to meet the listener's gaze?
These are all aspects that a good instructor/speaker will address. I submit that we can all come up with specific aspects of poor training. Avoiding repeating them is a step toward correction.
Brad is right to consider your audience first. I recommend assembling the listeners into like-groups so they will be more comfortable with each other, and you can apply the right language to each.
Some people will be fascinated by goofy visual displays of things done poorly. I expect the line workers would more likely appreciate this kind of humor.
Top managers, on the other hand (unless they came up through the ranks perhaps) would probably be more interested in cost benefits, increasng market share and avoiding problems with regulators. Your talks about quality programs (ISO is just a template for the quality program) could include stories about how other companies enjoyed big profits from doing things well. For such stories, mine the Baldrige award winners at
this site. Sometimes you can find easily quotable sources like
this one if you know what company to Google.
You might also tell them that making a functioning QMS isn't a certain path to utopia--problems can still come up, especially if there are suspicious dealings. See
this article for an example.
I hope this helps!