What's your favourite "blank is so tight" joke?

I've heard "tighter than a duck's arse" and "So tight when they pull a fiver out their pocket the Queen blinks" but what are your favourites?

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Tights as a gnats chuff.

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YES!! Always wondered what a chuff was haha

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a vagina

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Tighter than a nuns cun*

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I overheard one once, said in a pub totally nonchalantly in normal conversation, but feel it might be a bit extreme to type out in full...

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Ya cant say that, and then just NOT type it ... Wtf

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Tighter than a nuns a**hole

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Submarines door

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Tight as a nuns cunt.

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😳

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Things that are tight

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He is so tight he only breathes in

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Tighter than rambos headband

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Tighter than 2 coats of paint