A swimming pool is a good example. To assure than any surface with which one has contact is at the same potential, all conductive elements of the pool, including the water, are bonded together. The bond is present even if no components are intentionally grounded. Stray voltages from power transmission elements can be present and pose a hazard unless proper bonding is assured.
At my age, I'm accustomed to restaurants asking me to pay in advance, but now my bank has started sending me their calendar one month at a time.