Link: Comic 58
Title: Rupert hits the town - part 3
Date: March 21, 2005
Summary: Steve microwaves a cockroach.
Number of panels: 4
Steve: (operating the microwave) "Hmm... what setting shall I use?"
Steve: "...this one'll do"
Steve presses the "MUTATE" button with a BLEP!
Rupert: "What fun! A whirlygig!"
Beaver: (entering the scene) "Mmm... that smells good. What's cooking?"
Microwave PING!'s, a mutated Rupert breaks out with a GRAAAA!
Steve: "Uh... pizza?"
The timer on the microwave reads "00:00" throughout this comic. As James explained, "It starts instantaneously after the end of the 2nd panel, and beaver speaks in the third panel just as it reaches zero. We see the zero before we hear the ping because light travels faster than sound. I have it all figured out." (Reference)
Apparently Beaver has a full set of teeth behind his bucktooth, as evidenced by the last panel.
The "Uh... pizza?" line may be a reference to the Teenage Mutant Ninja Turtles episode "Case of the Killer Pizzas" where Baxter places eggs on pizzas that hatch when baked in a microwave, the creatures mutate into large killers further in the episode.