Well, there are conjoined twins in real life and we can tell a story about them so long as they're not the brunt of the jokes. In this, they're the heroes of this story; we love these guys.
I'm an equal opportunity reader - although I don't much read plays. And since I was raised a Presbyterian, pretty much all pleasures are guilty.
It is very true to say that work done by writers is quite often an attempt to give solid expression to that which is bothering them... They feel they have got it right if they express the stress.
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