Coffee on your laptop
1. Turn off the laptop immediately, turn it upside down to let the liquid drain out, and remove the battery before attempting to dry the computer. Yahoo Tech has a more detailed how-to here.
Even then, coffee, especially with sugar, can leave parts of your keyboard useless. In a pinch, some combination of other keys can get you limping through a demo. The "Tab" key, for example, can move you around a screen, and if you can't type a specific letter, try copying it from another word.