Hey, it's human nature to use the bathroom. It's simply routine, everyday life, unless... someone leaves a toilet paper flower on the handrail. A small, unexpected, pleasant surprise.
Surprises are good to use in writing a story. Authors like them, readers love them!
Now, what are you going to do to surprise someone? It can be as small as a toilet paper rose or as big as a loaf of zucchini bread. (I'll send you my address for the z-bread!)