Why?

Hayden caught a case of 'The Why's' from Mason when we were in the Outer Banks this year. He now asks 'Why' to everything. Example of typical conversation:

Me: Please don't jump on the couch
Hayden: Why?
Me: Because it's dangerous, you can fall and hit your head
Hayden: Why?
Me: Because the table is right near the couch and you aren't looking where you are jumping
Hayden: Why?
Me: Why aren't you looking? I don't know why you aren't looking, maybe it's because you are too busy asking Why.
Hayden: Why?
Me: Stop asking me Why!

--please note that I don't just say ' because mommy said so'. I try to answer with a full explanation but still, the Why's go on and on.