I remember taking Organic Chemistry in college, and totally loving the subject. I've forgotten most of it, but it was the most fun I've had in a course (that and regular chemistry plus lab). I actually made up a filk to the tune of "Tannenbaum" that goes,

"Oh Isovaleraldehyde, how lengthy are thy carbons,
Oh Isovaleraldehyde, how lengthy are thy carbons,
five carbons long, five carbons wide,
no matter how we tried and tried
We could not reach the other side
of Isovaleraldehyde..."

Ah, the fond memories.

Yes, I'm a little strange...