I did something similar once with two bottles of lemonade that were taped together in a double pack. I decided to separate them with one chop of a carving knife samurai-style and missed.
Firstly, the explosion was loud enough to nearly kill next door's cat. Second, the force sent the lemonade up in such an arc that most of it actually missed me and ended up around me on the floor/ceiling/walls. Also, it blew the knife out of my hand to the other side of the kitchen.
So, I'm not entirely surprised they ended up on the floor.
Weird. We tried this for a labor day years ago. We were going to make whiskey and coke slushies so we just poured a couple shots worth of whiskey in 2 liter bottles of coke so we could drink them down at the skatepark. Then we forgot, for at least 24 hours. The tops were impossible to get back off when we remembered the next day, so we just kind of cut in from the top. A little fizz but that was about it. Then again, it was probably the whiskey.