A: That girl is way out of my league.
B: You never know. You could be just her type.
A: I should probably just give up on the lottery. I’ve never won anything.
B: You never know. One of these days you might hit the jack pot.
A: How did the job interview go?
B: I think it went well, but you never know.
A: Will you be home for dinner today?
B: I think so, but you never know. Things tend to come up at the last minute these days.