I was forced to go to a positive-thinking seminar. I couldn't stand it. So I went outside to the parking lot and let half the air out of everybody's tires. As they came out I said, "So, are your tires half-full, or half-empty?"

A darkly comic riff on the cliché “Is the glass half full or half empty?”, the joke satirizes the forced optimism of “positive thinking” culture. By literally making tires “half-full,” the speaker exposes how such seminars can reduce complex realities to simplistic attitude tests. The vandalism is intentionally outrageous, underscoring the resentment some feel when pressured to perform cheerfulness rather than address real problems. The punchline turns a motivational slogan into an absurd, concrete scenario, suggesting that optimism/pessimism framings can be manipulative or irrelevant when circumstances are materially altered. The humor depends on the mismatch between self-help rhetoric and the real-world consequences of someone’s actions.