If we're talking clever lyrics and rhyming schemes, I would submit:
Lyrics (it's kind of hard to hear the words on first listen) with possible minor errors:
http://songmeanings.com/songs/view/3530822107858561396/I specifically love "sin and illness" in "a crime, crime, crime/ sin and illness is time". It's almost like an auditory palindrome: the 'sin' at the beginning mirrors the end of "ness" (or 'sen' backwards).
There is also heavy use of consonance and alliteration, and I think the song breaks up into different consonant blocks: starts with a lot of 'm', 'b', 'l, and "soft" 'n' sounds, also with alliteration of 's'. Then it moves into a more... harsher? harder? pattern with 's' sounds throughout ('slipped us mickeys', etc.) , with "harder" n sounds. (Not sure I can explain what I mean by "soft" 'n' and "hard" 'n', but first they work with the more calm 'm' sounds that make them feel softer and then with the second verse ('sin', 'illness', 'neither', 'nor', 'nasty'). Then it goes softer again, with "w" and "r" sounds throughout. Since the song also has a theme of changing seasons, I think this kind of pattern works on multiple levels.
The simple end-of-line rhyme scheme is standard, I think, but the internal structure is, at least in my opinion, really neat.
Not to mention the actual lyrical content, which contains some metaphors that I think are just hilarious and particularly clever. Like love is lighter than air, so our only hope is to climb into a blimp of romance. You know, because blimps rise above air; maybe we can catch our fleeting love with one. Love which by its very nature slips through our fingers (say, like sand) as time goes on. So we have to do things to keep it alive (getaway at the beach), but time still fights us, so we need to make big romantic gestures to save it.
Also, fulsome. What a great word.
Well, I really like this song so I guess I'm biased, but I feel like everything in it works really well together.