What did one detective say to the other detective?
"Disguise is lookin' suspicious."
Suspicious Disguise
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Explanation
Experiment
Explain Bear
Listen here, you uncultured swine. The joke is a pun. One detective is saying that a "disguise" looks suspicious, but he's also saying that the word "disguise" looks suspicious because it sounds like "that guy's". In short, it's wordplay, something your underdeveloped brain can't comprehend.