Not really a mixed idiom but certainly amusing.
North London, 30 secs ago.
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The Early Bird Contracts the Worms (instead of gets the worm) – Short-Sleeve Unisex T-Shirt
£21.00 – £31.50
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Buckhurst Hill - Unisex T-Shirt – in the style of Cypress Hill - Essex
£21.00 – £31.00
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It’s like burning cats (instead of Herding Cats) – Unisex classic T-Shirt
£21.00 – £31.50
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Escape Goat - White Cotton Unisex t-shirt
£26.50 – £27.50
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Muswell Hill in the style of Cypress Hill - London N10 - Women's Relaxed T-Shirt
£23.00 – £25.00