This prompt was easy: I took a photo of the teeth of one of my dad's huskies and then zoomed in and set it as a monochrome bitmap – a technique I've used for title screens of some of my games:
It doesn't show the bigger picture (a peaceful doggy lying on the grass and being bothered by me prodding its lips). Instead it give you a glimpse of something primal that simply reads "predator!" to your instincts, I hope.