Do an Elasto Blast into a slime or former member of the Plob in the town. They will jump around a lot. If you talk to them once they start jumping less high, they will say something different than what they usually say. Note: This will prevent you from using things like Tank Masters and using Splodgy Dave's store until the corresponding person recovers after a few seconds. Also, you can only do this to the Wyrtle (the dragon/turtle thing with the huge shell) if you do the king of Elasto Blast where you start flashing.