Idioms
Never say Never, it means you should never say never because anything is possible and it could happen even if you think it never will
Example : I will never win lotto, and the next day you win :)
# I have seen many people use the phrase "my bad" in Internet forums. What does it exactly imply and is it a proper English phrase?
Yes, "my bad" is a proper English phrase. It is an apology; when you say "my bad", you're basically saying, "I admit a mistake" or "my fault, sorry for that"