In all of his years and years of framing this has never happened - and it happened on our house! The builder's house is supposed to be the most well-built house! But I guess these things happen. Apparently there was a tie at the bottom of the forms that WAS placed correctly, but for some reason or other it broke. This resulted in a MAJOR blow-out and concrete was flowing everywhere but the wall it was supposed to stay in!
Somehow they managed to fix it and repair the wall. They piled a truck-load of stuff in front of it to keep it from happening again and kept on pouring.
So we ended up using a bit more concrete than expected, but what do you do? It'll all turn out fine in the end.