We had an hour long tanty and I still don't know why ... I think she had a sore toe ... it was hard to eat dinner with the wailing banshee from hell 3 feet away. After that she ate her dinner nicely and went and had a bath and you'd never know it happened.

Usually we get little tanties whenever we say no for any reason, especially if she's trying to help and we say no (don't really need help with a hot oven, for example) but then she's a grump and anything will set her off when she's tired. I got a huge tantrum once because I told her not to hang the clean socks I'd just taken off the clothes airer back on.