Pretty much everything Muggle does or says, starting with his introduction.
: Knowledge is very important Max. Socrates once wrote that it is the only good and ignorance the only evil. Excuse me... I'm gonna explode
- Max asks Muggle why he would mind sharing a sleeping bag on their camping trip:
Muggle: "Well, sometimes, in the middle of the night, I burst into flames."
Max: "...I snore a little.
- In "The Lady Doth Protest To Much," Max yells at Muggle to "Hustle!" (i.e., run faster) to catch up with a truck. Muggle takes this to stop for a few seconds and disco dance. The orchestra even starts playing "The Hustle"!
- Beautifully quoting a passage from Hamlet ("For in that sleep of death...") during Felix's memorial service.
Max: Didn't Hamlet say that?
- An a few minutes later, when the gang is trying to figure out what to do about the cats:
Trixie: They're cats, we're rats. They're big, we're small. What are we supposed to do??