Yep know the feeling. When i'm near school i get to worry and i definately have to go. I go to every level until i find a public toilet where i'm alone. That's not easy when you got to go...
Sometimes people take the stall right next to me i can't believe it, there are about 15 stalls and still they take the one next to me. Then they start plopping away. I don't think i ever dropped one when someone is near me