For example, if it's true that it's raining, and it's true that I'm inside, then it's true that it's raining, and I'm inside.
Formally:
A B ∴ ( A ∧ B )
... as a wrist exerciser device. Once the gyroscope inside it is going fast enough, for example after starting it with a short rip string or by a snap of the thumb, a person ...