I do not like

I do not like when people say, "That'd be just my luck..." and then follow it up with something bad that may happen.

Luck is not a real thing, people.  You'd be better off being honest with yourself and those around and say, "Woah is me!"  Or, "I'm going to preface this sentence by feeling sorry for myself..."

Source

But luck isn't real.  It's just another way of saying you think you are more extraordinary than everyone else. 

For example, "It'd be just my luck that it rains all day tomorrow."

Fact: If it rains on you, it rains on everyone (i.e., not your luck) (i.e., the result of atmospheric pressure) (i.e., get over yourself).