Glaze and I got in a fight. It's ok, we've made up now.

Large Hobbit Hazel Fruit Bowl with Bird Matte Accents
red/white clay mix; half glazed in bird matte and half in hobbit hazel, then all re-glazed in hobbit hazel; 9" diameter and 5" tall
Well... this one was a doozy. I actually loved this bowl when I threw it - at the time it was one of the biggest things I had ever made. It had a deep center and a slightly flared lip. I tried to do a glaze pattern I had seen someone in the studio do - mix bird matte (a matte light orange color) with hobbit hazel (a textured brown/blue color) and they would make neat colors. Unfortunately, I totally screwed up the bird matte and the whole thing looked pretty sh*tty.
SO I decided to re-glaze the whole thing in hobbit hazel, trying to salvage it. I heated up the bowl really hot ( so that the new glaze wouldnt just slide off the surface) and dipped it in the vat of glaze. THUNK. I heard a deep thunk as I dipped it... as if the temperature differential forced the bowl to crack. When I took it out I didnt SEE a crack... so I continued on and put it in to be fired. Well, I was right, the ceramic spit down about two-thirds the height of one of the sides. Pretty intense. The bowl is now useless as a show piece, and cant be used generally in a functional way by anyone but myself (who will overlook this huge imperfection for the sake of just having more pottery in her apartment.)

Oh well... live and learn. Next time I will NOT be heating stuff up quite so much.