The Dangers of Having a Surname Null in Public Speaking

I can see it starting off with a joke working in the entirely opposite direction, meaning that people will stop listening if they don't like your joke. Well, I mean, I can understand that advice looping back again to what we're saying about having a relationship or knowing the audience to a degree. So you've got shared information and a shared space which means certain jokes will work. Recently I did a talk for programmers. And I was able to work in jokes about people having the surname null because in programming using the word null means that it's an empty string. But for them, of course, it worked. It means taking something funny and then also using that to prove a point