In America, as far away from me as possible.
I dont like any kind of sweet sandwich, it just seems wrong to me, and a PB&J sandwich just seems like recipe for a sugary glue made to clog up your innards. I may soak one in water and use it to hang wallpaper, but I would never eat one.
However I do, very occasionally at breakfast, enjoy a slice of brown bread toast with peanut butter and either grapefruit of lime marmalade on it, but I would never put another piece of bread on top of that and call it a sandwich... John Montagu would turn in his grave.