Condumb

When my wife had to go off the pill, I called a place that sells condominiums. 
When I said that I wanted to buy some so my wife wouldn't get pregnant, they laughed and said that I'm dumb.
I asked them what was so funny, I asked them what were they laughing about.
They said when it comes to me needing a brain transplant, there is no doubt.
I still can't understand why they laughed hysterically and said that I'm so dumb.
Do you have any condominiums that you can sell, I really need to buy some.