The Things Beginning To Fall

There are things that unexpectedly happens. Things start easy but sooner or later it gets complicated and more. Some says, things happen for a reason, while others believe it's just an art of cliche. When do things beginning to fall? Is it when everything becomes difficult? Who make things beginning to fall? Is it your friend of a traitor? Or is it simply yourself? I sure know one thing only but that's not why things beginning to fall. It is..
.
.
What are the things beginning to fall? I, thee.