SPACE BRAIN/FRAME
Topic: Music
I recently heard Guns n Roses' ode to extreme intoxication, "Nightrain," which employs several metaphors to describe various feelings and degrees of inebriation:

Loaded like a freight train
Flyin' like an aeroplane

Then I got excited, because I thought the next line was:

Feeling like a space frame

Wow a reference to 3-dimensional truss structures! But then it turns out the actual line is space brain, which is still pretty cool, if it's a reference to an episode of Space: 1999, but the most logical reference is just to being high and spaced out which is boring and predictable. Actually, 'Flyin' like an aeroplane" is pretty quotidian, although the old-fashioned version of the word makes it alright. The first metaphor gets my vote.