When Lilo is blamed for pranking her strict substitute hula teacher, she decides to use a practical-jokester experiment to get revenge and impress Mertle. However, things don't go well for Lilo when Stitch interferes with their plans. Now, PJ has set up the ultimate prank, and Stitch must stop them before the jokes go too far.
- When Pleakley tries the money prank on himself, Lilo switches back and forth from wearing her red dress to wearing her nightgown.
- Moral: Playing jokes on others can be fun, but only if the other person is laughing.
- Side Moral: Don't accuse people of doing something they actually didn't do or that never happened in the first place.
- Although Lilo used Drowsy to put Stitch to sleep, Stitch somehow managed to wake up on his own while under Drowsy's effects, possibly indicating that other experiments are not affected as much.
- The strict hula teacher never found out that Mertle, Elena, Teresa and Yuki were actually the ones who threw the paper airplanes and drew the mean pictures until towards the end, after PJ's ultimate prank backfired on him.
- Lilo shows a little compassion by trying to defend Mertle when she got blamed for the prank that Lilo and PJ had concocted (even though Mertle clearly deserved it).