jmckelvy - My DH and DS would have preferred the slider valve to stick when going from low altitude to high altitude :)
We have a 5 gallon porta potty, and despite my REPEATED warnings to "burp" (before you use it you crack the valve open to release the pressure in tank) the toilet after we got past Denver, BOTH DH and DS had a, how shall we say it, unpleasant surprise shower when they went to flush the toilet after use. I even posted a reminder note on the lid!
I admit I laughed myself sore when DH did it. Good thing we have a wet bath, and on that trip we had no set time schedule. I think the stoppage for the cleanup was around 30 min. LOL.
When he kept calling out, "Hey, are you gonna help me out here!!?", I replied, "Nope. I already made a note the size of the seat, and clearly explained WHY you need to crack the slider valve and release a little pressure before you use the potty. I am most certainly NOT going to squeeze inside the TC in 100 degree heat in New Mexico, in July, and assist you in mopping up a mess of your own making".
Moral of the story is that sometimes no amount of education and nagging will replace having the porta potty explode in your face as a reminder LOL :) Another moral is that my DH can play dirty.... a few hours later we stopped for the night. I went looking for my beach towel so I could take DS to the pool. I looked all around the TC and couldn't find it. Asked DH if he had seen it and was told that once he ran out of paper towels, and used the 2 spare rolls, he used my beach towel for the final wipe-up and then pitched all of it in the garbage at the rest area 300 miles back.... he did offer to buy me a new one LOL.
Despite all this, we still love the porta potty and would get another one or a cassette in the next TC.