What could swallowing glass marbles do to your health?

I have a rich friend, he gives us money for doing silly things, stunts, eating strange things, all sorts, like jackass, but on another network. He has bet me $100000 if i can eat 50 glass marbles, I dont have to chew them, just swallow them, and I have one day to eat them all.

What would be the health issues involved in doing this?

Would the marbles come out with number 1’s or number 2’s?

I really want to do this one last stunt for him, maybe then he will let my family go, a lot of people think what we do is funny, but some of us have long term injuries from these stunts