anything can happen

Any outcome is possible. The game's not over yet, so try not to be so pessimistic—anything can happen. Anything can happen when you're on a bike, so I'm not letting go out without a helmet, got it? The film's twisting narrative and trippy visuals create a kind of alternative reality in which anything can happen.

anything can/might ˈhappen

used to say that it is not possible to know what the result of something will be: ‘There’s no way we’re going to win this match!’ ‘How can you be so sure — anything can happen!’