Today's phrase is a good one.You can use on many different occasions.
" These things happen ".
This means that it is common for something unfortunate to happen or for people to make mistakes, so there is no use worrying about it.
A. I can't believe I sent the wrong order to my customer. My boss is very angry.
B. Don't worry about it. These things happen all the time.
A. I feel terrible. I broke your glasses.
B. That's alright. These things happen and it was an accident.