Telling "Jokes" is usually a bad idea for most speakers, but getting laughs is great for any presenter. Isn't this contradictory? The problem with jokes is that they seemed forced and they scream out to the audience "Hey, I'm trying to be funny, so you'd better laugh now!!!" And nobody likes to be told to laugh on demand. But a speaker can get generate lots of laughs without ever telling a joke. The key to humor is simply being able to pounce quickly on the absurdity of any situation. And if you can poke fun at yourself you are in great shape.