Michael trying to explain to the office he can no longer be friends with them, but Jim gets him to say his catchphrase, "that's what she said," within 30 seconds of him trying to finish his speech. Just a reminder of how little willpower Michael had.
Who else gets the song stuck in their head? I watch this episode over and over again and it still cracks me up when Michael tries to give the kids batteries to make up for not being able to pay for their college.
Michael coming up with the "genius" idea of having everyone try to guess what their ethnicity was came from a good place but the execution just wasn't there; though it made for some hilarious moments like Pam trying to explain Dwight's card.