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The peanut butter and banana sandwich (with or without bacon/bacon grease) is often referred to as the The Elvis because it is widely known that Elvis Presley ate many a PB&B sandwich in one sitting.
How I know that, I'm not really sure, and why it gives me somewhat of a thrill every time I eat such a sandwich, I don't know. It might be because I really like Elvis. (I mean, have you listened to Jailhouse Rock lately? So good!) And it might be because I find it fascinating that people in the '50s did the same things as people now. (Really, that thought never gets old.)
One thing I do know is that minus the bacon/bacon grease, The Elvis is a highly nutritional sandwich. I like to eat mine on toasted whole wheat English muffins or flatbread. A few tablespoons of crunchy peanut butter and a sliced banana make it a low-calorie, healthy meal!
Now, go! Get thee to a kitchen and make The Elvis!