If you talk to Weird Ed Edison about his new hamster, he'll mention that he once had a white hamster with spots "But, something...happened to him," and all Ed can remember about the traumatic incident is a horrifying "DING!" sound in his nightmares. This is a reference to an ability in the original Maniac Mansion for Syd or Razor to put Ed's hamster in the microwave and blow it up. If you choose to show the rodent's remains to Ed, he'll kill you in a fit of rage. The hamster-in-the-microwave is also referenced later in DOTT when Laverne has to put the frozen hamster inside the microwave from the future.
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