Trew's laws
- Trew's law of cardboard boxes states that given any two cardboard boxes, one will not fit inside the other.
- Trew's law of game shows states that the more difficult a game show is, the less valuable the prize will be.
- Trew's law of handbags states that a handbag is the mathematical definition of a set: that is, a possibly infinite collection of objects, no two of which are identical.