(Image credit: Culture Crave via X) A series of strange posters has popped up across New York and LA, bearing a wholesome declaration of love and an unknown number to text. As the days passed, the billboards grew more intense, turning the tone from endearing to obsessive, and for those brave enough to text the mystery admirer, a concerning surprise was lurking. But no, this wasn't the work of some bizarre stranger on a love quest; it turns out the stunt was an interactive campaign for the upcoming horror movie, Obsession. Making expert use of traditional billboard ads and guerrilla marketing, the creative campaign sets a new gold standard for film branding. Billboards spotted in NYC & LA asking people to 'text me' grows more obsessive each day⚠️ Text at your own risk 📱'Obsession' is in theaters May 15 pic.twitter.com/846N828S7U May 6, 2026 At first, the billboard seemed pretty innocuous, with a sweet message reading "I love you so so much!…