So I was SUPER pumped yesterday! Began my home brewing journey by brewing my first IPA. Everything worked out pretty well, my initial gravity was a perfect 1.051 when I put it in the carboy. My temps were prefect along the way, and everything was going great. I added my yeast, but was skeptical because the instructions said to shake the carboy BEFORE you add the yeast. I was worried that the yeast wouldn't mix very well in my wort. My father in-law (who has doctorate in biochemistry and a home brewer for over fifteen years) told me to shake it after I added the yeast to oxygenate it before I capped it. Now I've got a huge mess. After one day of fermenting, it's completely overflowed. What went wrong?