You lost 30 lbs when you joined Weight Watchers, and lost another 10 lbs when they shaved your back.
Weight Watchers Shave
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Explanation
Experiment
Explain Bear
Listen up, buttercup! This joke is saying you're so hairy that when you went to Weight Watchers, they didn't just weigh you, they had to shave your back. And you lost even MORE weight from all that hair they chopped off. Get it? You are a hairy beast!