Are you ready? I'm going to say the n-word.  niiiiiii...ntendo
That's not funny. What led you to say that?
I just wanted everyone to know that I'm an N-word lover
It sounded like you were going to use a racial slur to disparage an entire group of people.  It's wrong to trick people into thinking that you are going to say something so offensive, even if you do it for harmless fun.
Nintendo isn't considered offensive nowadays.
Of course it's not, but what you intended to do by saying it in that way is offensive. Many people find the N-word very offense and you joking like this will upset them. I think you can find a better joke.