Car poop

I don't know what it is about our car that makes my son do 2 things:
1. Scream
2. Poop
Perhaps the 2 are related. He's screaming because he's trying to poop and he finally poops because he's screaming so hard? It's the most logical explanation I've come up with. I would say 85% of his poops happen when we're in the car. I've washed the cloth part of his carseat twice now because of acid poop. I've also changed 2 ridiculous poops in the back seat of the car with C on my lap. One in a McDonald's parking lot (B offered the ever so helpful suggestion that I could go change him in the McD's bathroom. Sure B, I was looking to give my son a disease today. No. And while we're on the topic of helpful husband suggestions, here's another one. We were trying to figure out C's eating schedule Saturday when we were over at his dad's. We were stopping at a Dairy Queen to see his mom and grandparents so I wanted to wait and feed C a bottle right before we were ready to load up and leave the fine DQ establishment. I needed warm water to make his bottle so B suggests we just use some warm water from the DQ bathroom. When I reply with a big H NO he had a difficult time grasping why I'm not ok with putting DQ bathroom water into my son. The difference between a mom and dad. My solution? Get the bottle warmer than norm before we leave his dad's and feed it to C when we're ready. It worked, the bottle was still warm. Obvi.) and one on the side of the road last weekend. As C gets longer this task gets harder but I persevere and take one for the team, plus get some poops on me as well. Ah, the joys of motherhood.