Reese's Whachamacallit

Pleasingly, the "whatchamacallit" joke worked within an hour of my eating the chocolate bar. I was sitting in a large, open drainage channel, against a wall lined in graffiti, watching stormwater gliding down the middle. When Tim came to join me I said. "I've got a headache, from the whatchamacallit."
"The shit?" he asked, persisting with the myth that we were sitting in a sewer, and not merely a concreted natural drainage channel.
"No, the whatchamacallit ," I stressed, removing the remains of the wrapper from my top pocket.
I thought of the stream of humourous letters that must make their way to Hershey's, relating the misinterpretations of "whatchamacallit". These misinterpretations could have potentially dire effects on relationships, bringing assumptions to the fore.
What the name has to do with the chocolate was unclear. A mixture of peanuts, wafer, caramel and milk chocolate, the "whatchamacallit" was pleasant, but nowhere near as satisfyingly weird and American as, say, a Cherry Mash. Whilst eating it I thought of the American fascination with merging peanut butter and chocolate. Where did it come from? I tried to think whether the US was a big peanut producer, for some reason I could picture a logo for "Californian Peanuts", with a peanut-man with red white and blue stripes on its shell (very likely a melange of various other product mascots). The salty/sweet mixture is confusing and exciting for the tastebuds, perhaps that is the allure rather than anything to do with peanuts themselves.
The watchamacallit was quite delicious, although it wasn't the kind of chocolate I could become obsessed by. Despite the cheeky name, the chocolate bar failed to create a lasting impression.