Motivations

Company perq: Free drinks at work, including coffee, tea, soft drinks and juice (but, curiously, not bottled water).
Positive result: Liquid intake increased.
Negative result: Kidneys working overtime, bladder stress, path worn between desk and bathroom.
Unintended side effect: Understanding aggressive driving. Forgetting to stop by the bathroom before the end of the day can really motivate you to get home as soon as possible.