When a baby is born, you never know what they might grow up to be.
I don't think so either, but you never know what vampirism will do to a person.
After all, you never know what you'll need in the future and dental fees are very expensive.
The bad thing about being mated to an Oracle – you never know what she's plotting.
Ah, well, you never know what strange interests real ale aficionados are going to acquire.