I know one thing: When they do have a seat, it's covered with urine.
I'm always amazed by the number of men who unbuckle their belt and pants to take a leak. Same way mommy showed them when they were little boys.
In a close second place are the folks who use 10 ft of TP to wipe their behind. One person fills the trash can with one dump.
It's always nice when a Dominican explains that toilet paper should not be flushed in the toilet even though the name "toilet paper" suggest just that! It will plug the toilet and it's not the fault of the toilet they are designed that way. Its the dumb gringos fault. Like expecting electricty in an zone that states 24/7 electricity....Maybe toilet paper should be renamed "paper you-throw-in-a-bucket-beside-the-toilet-after-you-wipe-your-ass". Its also very pleasant when you enter someones bathroom to enjoy the sight of a bucket filled with "**** paper" and the obvious pleasant smell.