I often see this particular bit of advice thrown around a lot when it comes to being funny. It’s a pretty easy way to get a laugh, so I can see why it’s so popular – the problem is, that this particular advice can be very detrimental if you are a Speaker or Presenter. I feel that this style of humour has the potential to damage your credibility as a Speaker and should be avoided at all costs.  (Or if you must insist on using this style of humour, at least make sure you are very aware of the possible consequences.)