I like watching the odd B-movie from time to time, especially 'creature features'.
On the topic of stupid films, one of my favourites is Flash Gordon. It's daft and cheesy, but I love it!
I'd probably say that at my age, watching anything predominantly aimed at children would be classed as a guilty pleasure.
I like listening to novelty pop/rock songs, sometimes (eg. John Kettley is a Weatherman, Nellie the Elephant, Star Trekkin', etc.).