some might advise a firm slap or neck wringing..

alternatively,
as soon as you catch the cat in the act of pissing where it shouldn't

quickly apply 2 or 3 drops of tabasco to both its nostrils..

might not stop it making a foul stinking stain on your carpets and bedding..

but revenge is just so sweet !

[and a more hygenic response than old fashioned punishment to rub its nose in its own urine ]