Ratchet and Clank: Size Matters
Daxter
Metal Gear Acid 1 & 2 (If you're into that kind of stuff).
Other than that, I would normally suggest you shoot it eight times, douse it in gasoline, put in a car, drive this car off a cliff and jump out at the last second, shoot that gas tank to make it all explode. I don't like the PSP.

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