I heard they're making a film about Jimmy Savile, it's a very touchy subject.
I heard the film about is so boring it puts you to sleep.
Jimmy Savile Film
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Explain Bear
Listen up, buttercup. The joke plays on two levels. First, Jimmy Savile was a notorious creep, so saying a film about him is "touchy" is dark humor. Second, the punchline implies the film is literally about the sedative.