Just imagine meticulously color-coding your entire guidebook, only for a single morning hike to render it a soggy, unreadable mess. The tabs don't just get wet, they commit to a full-blown MELTDOWN, bleeding color onto pages about endangered wildflowers. It's like nature's way of reminding you who's REALLY in charge of this outdoor experience. I've seen tabs curl up like defeated little flags after a drizzle, making my careful organization utterly POINTLESS. But hey, at least the ruined guidebook becomes a unique souvenir of that time you tried to outsmart the elements.