You can "rewire" your brain to be happy by simple recalling 3 things you are grateful for everyday for 21 days. then find 3 more! I did 100 days of happy and I've been happy for something most days since :)
In a public bathroom the stall which is the closest to the door is usually the cleanest because it's the least used. Public bathrooms - Makes sense to me. I usually skip it thinking it's the one people will use the most.