Infinitely variable, incredibly adaptable, endlessly versatile and really cheap . No, there is too much. I'll sum up. Pick your Thuddite carefully. The most pompous, plodding Thud you can find who is accessible to you.
Bosses are ideal.
Do this slowly and subtly, with accomplices if at all possible. Say nothing . Do not get caught. Another variant, usable only on people with ceiling fans, is to drop oily screws and metal bits underneath the fan, once every day or so. People become very worried, especially if they sit or sleep beneath the fan.