Ratchet and Clank 2 Easter Egg - Humorous Messages

On the planet Todano, the one with the rabid squirrels, you'll find a flying bus transporting tourists at the beginning of the level. Start killing the tourists by either smashing them with your wrench or shooting them. After a while you will hear a humorous verbal warning asking you nicely refrain from mindlessly killing the visitors. Continue doing so and more messages will appear.