I've always been fascinated by prophecies that characters actively try to subvert, only to make them come true through their very efforts to avoid it. There's a delicious irony in that, and it speaks to a deeper theme about free will versus determinism that gets under my skin. A prophecy isn't just a plot coupon; it's a psychological cage. The character becomes so obsessed with defying or fulfilling it that every choice is filtered through that lens, which often narrows their vision and makes them blind to simpler, better paths. They might reject a genuine ally or embrace a terrible bargain, all because the 'fate' they're fighting against or for has colonized their decision-making process.
A classic example is 'Macbeth'—he's told he'll be king, so he commits regicide to make it happen faster, but that act of forcing the prophecy corrupts everything. In modern romance or fantasy romance, you see this with 'fated mate' tropes. The characters know they're supposedly destined, and that knowledge warps their initial interactions. One might fight the bond tooth and nail, pushing the other away, which ironically creates the very conflict and tension that forges a stronger connection later. The prophecy doesn't remove choice; it just loads every choice with extra, often messy, significance.