I made the mistake of chugging 1.5Ls of Coke Zero when it first came out (I was a dumb teenager at the time). The original formula was much gassier than what it is now, and I went through the bottle over the course of maybe half an hour. After I was done I started vomiting and had to be bedbound for days recovering from what feels like food poisoning.

I think it probably would also have happened if I drank the normal stuff but the gassiness of Zero certainly accelerated things.