In my year 9 maths class we had a new teacher and she told us that "this year is crucially important in preparation for your GCSEs, and I will always be there to help you through your exams". Thats what she said and less than a month later we never saw her again, she didn't even tell us that she was leaving!
Oh yeah I've got another one, this time from primary school. We must have been only 5 or 6 years old at the time but we made paper-mache bugs with old bottles as a class project and for 6 year old they didn't look too bad. The school decided to hang them on the assembly hall's wall so that the whole school could see them and the teachers said that we "can have them back at the end of your last school year in year 6". So year 6 came and everyone from my class had remembered what the teachers had promised and what did they do? They threw them away during the summer before our last year. Scandalous.