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The Doctor: Donna, come on, think: Earth, there must have been some sort of warning. Was there anything happening back in your day, like... electrical storms, freak weather, patterns in the... sky?
Donna Noble: Well, how should I know? Um, no. I don't- I don't think so. No.
The Doctor: [disappointed] Oh, OK, nevermind.
Donna Noble: Although, there were the bees disappearing.
The Doctor: [dismissive] The bees disappearing.
The Doctor: [sarcastic] The *bees* disappearing.
The Doctor: [revelational] The bees disappearing!