I was cast on a reality show, but it was one of those shows where they try to "test" your relationship, and I chose not to do it. They called and sent flowers and did whatever they could to get me to agree to be on the show, but I happily declined.
I live in LA, where a lot of the reality shows are made, so opportunities pop up often. A friend was producing some show about hair dressers, so I went and got a free haircut on camera-- but only because it was so not about me.
Also, another friend was chosen to be on Take Home Chef, and I wound up being her surprised dinner guest. There were four of us in all at that dinner, and they got us all good and drunk. It was a blast, and the host is a hottie!