Worst for me was backpacking for 2 weeks at Philmont Scout Ranch in New Mexico... Here are the type of toilets you can find (thanks to Wikipedia)
Several campsites also share a latrine or toilet. Philmont latrines have the possibility of housing spiders below the seat, which is why campers are encouraged to remove possible pests on the underside of the boards with a stick. The latrines come in numerous configurations, but all of them are for excrement only, and are not to be urinated in, in order to reduce smell:
The open-air style with two adjacent seats is affectionately called the "pilot to copilot" design; this results from the joking conversation which often takes place between two campers using the toilet simultaneously.
The other open-air configuration, called the "pilot to bombardier", is generally preferred because its two seats are back-to-back and offer somewhat more privacy than the "pilot to copilot".
Occasionally a "single pilot" - one open-air seat — may be found.
The enclosed configuration, with walls and a red roof, is known as the Red Roof Inn. Older Red Roof Inns contain two adjacent seats and no door, while newer models have two back-to-back seats, with a wall between.
