1. If you bend the arm on a set of non-flexible (expensive, prescription) eyeglasses just enough, it will break off.
2. Washable ink on a stamp pad is not really washable if you splay your palms across the pad, covering them entirely, leaving you a nice purplish shade for some time.
3. Trikes should not be ridden off the front steps of a porch.*
*and if they are, it hurts A LOT and leaves you with a large rash of road burn across your forehead and your parents wondering if you've sustained a serious head injury.