LOL I didn't know there are disposable ones. I went searching online and whoopeee I found a site with disposable ones. Can you imagine trying this for the first time....getting the proper aim and all. They're a bit pricey but if someone is grossed out enough, it might be worth it.
http://p-standingup.com/

The worst bathroom was in our local grocery store, when my girls were younger, they were always needing to go. Speaking of bad bathrooms.... there are some in the Middle East, where is an opening thingy, that's level with the ground. I never knew these existed and was stunned. I was at customs and had to go real bad...so I used it. You have to squat down and go. The all time worst was when I was a kid - we were camping and had to use an outhouse. Sorry for rambling but this topic is funny.