Idiom - A bad hair day

A bad hair day:

If you're have a bad hair day, everything seems to be going wrong for you.

Poor Sue's in a terrible mood. I think she's having a bad hair day.

I knew it was going to be a bad hair day when my car wouldn't start.

Persian: روز تخ-می داشتن

Idiom - on the off-chance

On the off-chance:

You can say you're doing something "on the off-chance" if you're doing it because it might lead to something that you want, even though it's not definite.

Photographers follow celebrities around on the off-chance that they can get a good photograph of them and sell it.

I'll call Frank and tell him where we are on the off-chance that he can join us.