Mostly good
The main thing I didn't like about this was the end. It just seemed a bit pointless and didn't lead to a funny final punchline. I still enjoyed this for the most part, because this is something that simply everyone can associate with. Well, all the male people at least. I have no clue if women in the bathrooms have this problem. From the title, I thought it was going to be about a guy looking at a woman's breasts.
The voices are decent and they fit the scenarios well. If I was going to the bathroom that quickly, I would wonder what it was I drank too. The artwork wasn't bad, it could just use a bit more detail. It seems like it's been awhile since I've seen a flash from you, KupaMan. It was nice to have a lot of music in for something mundane.