The horse ate a carrot, but still felt uneasy. Something funny was in the air, rolling toward the ranch like a cloud of evil flying monkeys. Something...not so good.
Harvey looked out the window, watching the horse dig through the garden. He'd always wondered what horses thought about...
Do we really need that foreshadowing first bit? Can't we just start the damn story without it?
It's true there's a lot of misuse of prologues, especially in genre fiction. What I said in my previous post regarding epilogues, making certain they're really necessary, applies to prologues but times a hundred. Readers will read almost any epilogue, no matter how useless or dumb, because they've come a long way, baby, and aren't about to quit now. But a prologue, well, a prologue is a big neon sign at the front of a novel and if they don't like that, you're pretty much screwed straight off. If it's too expositional, too preachy, too foreshadowy, or, worst of all, in fucking italics, they might just slam that book shut right off and never enter your carefully crafted first chapter at all.
And you want to be loved, don't you?