Don't wear rollerskates to a tug-of-war.
When in doubt, parenthesize. At the very least it will let some poor schmuck bounce on the % key in vi.
Orthogonality for orthogonality's sake is not something I'm keen on.
That being said, I think we should immediately deprecate any string concatenation that combines '19' with '99'.
Many days I don't write any code at all, and some days I spend all day writing code.
I'm never satisfied because I've been always interested in too many things and I always want to do everything at once.