Doonesbury by Garry Trudeau for July 24, 1982
Transcript:
Mike: What happened to Zonk's new terrarium? It's not out on the porch. Makr: It dried out. Z's upstairs trying to revive it. Mike: What? I thought terrariums were closed systems and didn't need much water. Mark: So did Zonker. But you have to water them once in awhile, or eventually they dry out. Zonker: Don't die, E.T.!