This senario that i'm going to get you to picture actually happened to me. The worse part is while I was trying to fix it, I got shampoo in my eyes. It really hurt. Please turn on your imaginations now.
Imagine you have had a long day. You go for a shower. Everything is nice and ok...until....THE TAP COMES FLYING OFF AT YOU! Whats the first thing you're going to do? Fix it. Now its all fixed, you go back to do what you were doing. Then the tap flys off at you again! (That didn't happen to me but it would be funny.)