Whither Surface?

In general, I can think of three main reasons one might pick a theme for a theme-based radio show. Off the top of my head, those are:

1) It's a holiday or famous day - like Halloween or a famous artist's birthday.
2) It's a day of special importance to the programmer - an anniversary perhaps.
3) It's arbitrary - for example, in the case of this particular theme-based radio show, the reason is often because of coincidence of repetition - I might hear many different songs in a short time that suggest the theme.

The reason for the theme of this week's Self Help Radio - which is "surface" - is the unofficial fourth way (which might seem to coincide with reason number 3):

4) For the life of me I can't remember why I picked that theme.

Here's what I know:

Sometime this year I thought "surface" would be a good theme for a show. Probably late at night. Perhaps whiskey was involved. I created a folder on my computer & put a file in it with some ideas. Later on it seemed to me I was ready to make that show - I had enough songs, I had some silly ideas for interviews, etc. & I put it on the schedule.

It never occurred to me to write down why that was the theme. & it is "surface." Not "surfaces." The word "surface."

& that's all I can say about that. But I will add the show airs tonight from midnight to 2am on 90.7fm here in Portland & online everywhere at kboo dot fm. I know, on the surface it doesn't seem like a good theme. But maybe there's something below the surface?