What's the difference between a Porsche and a pile of dead babies? I don't have a Porsche in my garage.
Why are you mentioning dead babies and a Porsche?
I am just presenting the fact I don't have a Porsche, and the audience would wonder why I asked the question in the first place. It would spark their interests while possibly making them cringe. I find it funny.
The death of a child can be extremely traumatizing to parents and affect their whole lives. Making light about it can be hurtful, just like you would be hurt if people made a joke about something that caused you pain. Maybe my saying this can change your mind and have you alter your jokes to something more acceptable to the majority of listeners.