I'm not one to combine pb and bananas with jelly (Now Nutella! That's another story!) but some friends go together like that, just a little on the edge.
Making someone a sandwich, even as humble and simple as a good ol' pb&j is a real act of love. Just think of all the sandwiches you've eaten; aren't those made by someone especially for you a million times tastier than the ones you've made for yourself?