The Mallet O' Understanding was a croquet mallet that Rat used to whack people he didn't understand.
Victims of the Mallet O' Understanding
Goat
Goat became a victim when he was being sarcastic to Rat.
Zebra
Zebra became a victim because he said the mallet wasn't amicable.
Pig
Pig became a victim when Rat said he would eventually disagree with him, to which Pig said, "Well geez, if that's how your gonna act, maybe I should get my own mallet. To which Rat smashes.
Rat (possibly to Goat's)
When Goat got his own Mallet O' Understanding, he presumbly smashed Rat after his broke.
Trivia
- Many people contacted Stephan Pastis and asked him where they could get Mallets O' Understanding.