Following up the thread about twang toed, I was reminded of an expression my mother (a native Londoner) used when something happened which was rather good.... she would say
"Well, that's better than a poke in the eye with a dirty stick!"
I have used this most of my life - I think it's quite expressive

- but a lot of people find it very odd.
However, I once met someone from Hull, and he said in his part of the world the expression was
"Better than a slap in the belly with a wet fish!"
which seems very appropriate for Hull.
Any other variants? Does anyone else recognise this one?