[ mona / prog / sol ]
I've never come across one personally, though once I did have to buy an ice cream to use a shop's facilities and that peeved me a bit. The ice cream was overpriced and average.
As a kid, I raised the toilet fee at one of my theme parks in roller coaster tycoon. People were very angry about it but some paid regardless, so I can only imagine the same thing happens in reality.