Curse a few times before ringing them and explaining you needed it tonight and demand they apologize You are disappointed but try to make a new plan You get so angry you think of some way to punish them for this You ring them up and give them an earful. The cheek of it!
The Tao is a fundamental idea in most Chinese philosophical schools; in Taoism, however, it denotes the principle that is the source, pattern and substance of everything that exists.