One time when I was a teenager some friends and I were driving out of town to attend a bush party. As we were leaving my buddy grabbed his stomach and said "dude...stop right now...I gotta shit. Dude please stop or I am going to shit all over the place". So naturally not wanting him to shit in my car, I pulled over by some rural mail boxes so he could do his business behind and nobody passing by would see. After a few minutes I hear this voice calling out "hey do you have any toilet paper in your car?". I called back "no man". I could see just enough of him to tell he was looking around for something to use as toilet paper. The only options I could see were pine cones and rocks...but neither of those would be a good substitute. I was laughing pretty hard at him...that's when I saw his hand reach from behind the mail boxes and pull one mail slot door open. He grasped a couple pieces of mail from this box and used this for his toilet paper. I thought this was funny, but what happened next was hilarious. I saw his hand reach back around the mail box...and put the "toilet paper" back into the mail slot.

I wish I could have seen the reaction of the owner of the mail slot when he went to check his mail and find this improvised toilet paper.