Story : This time the three Plonsters want to go to an art museum. Plummy who doesn't really want to go is dragged along. As soon as they are in the museum, Plummy creeps away from the other two. As Plif and Plops 'expertly' discuss amongst themselves, Plummy starts to change many of the works of art. Of course, the other two don't notice that Plummy is doing this and they start to complain that the museum catalogue is full of incorrect pictures. But Plummy starts to overdo it a bit, and the other two realise what is happening. An expensive sculpture breaks and the three of them have to look for a replacement.