Predestination paradox: because you had to know, it was going to be like this.
Imagine time like a never-ending elevator ride. You press the 'up' button, but it doesn't move. You press 'down', same deal. But, somehow, you always end up at the same floor.
This, in theory, is predestination. The universe has already seen it all, and it's just playing it out for us.
Or, you know, maybe you just took the wrong elevator.
Many Worlds Interpretation: because who needs just one elevator, right?
Buridan's Brain Teaser: for when you're stuck on the same floor