I eat my chili with a dip or two of peanut butter IN it. I always tend to get a reaction when I make my bowl. I simply hand them a spoon, give them a bite, and hand them the bottle of peanut butter.
I've done that too. Its pretty good but I prefer having the sandwich on the side.
I'm with Oliver on this. Most peanut butter nowadays comes in plastic bottles. When I think jar I think glass.