Design and Technology, or 'DT' is a subject that a student will take, thinking it will be useful, and a fun learning experience. Then they will meet their teacher, and they will wish they had never been born. Like the creepy gnome in your friend's garden, they will glare at you when you are not looking, and say dodgy things about you in front of the whole class. Design and Technology involves a lot of hard work, and strict deadlines, however most students do not survive long enough to discover this.
This is often due to suicide - as a result of taking the course, murder - of the teacher, or mass murder - homicide for the sake of the entire class.
"He committed suicide out of despair and insanity." "Must have been a Design and Technology student."