They're often called "guilty pleasure" songs.
I've found over the years when talking to people about music, whether musicians or not that most people have a song they love that is completely outside/left field of their general taste in music.
I've found a somewhat cheap thrill in finding out these "guilty pleasures".
Being music obsessed I've had more conversations with other people about music than any other subject and the majority of them can get pretty intense, such is the nature of music.
Quite often, I'll guide the subject towards "guilty pleasures".
I've found some great ones, for example my Death Metal/shred obsessed pal has a serious soft spot for Abba's "S.O.S.". It took a few bottles of Brown Ale and a jazz woodbine or two before he told me. I nearly fell off my chair.
Anyway here's mine (no guitars whatsoever), feel free to reveal yours.