For Databases, it takes me a concious effort to not go to at least 3rd NF.
Except for addresses/names/telephone numbers, I have been burned by ANY assumption I made. Those, I tend to just store as something like char(255) nowadays by default, unless business requirements force me to split it up, but even then, after voicing my concerns.
Edit: reading up on the addresses falsehoods again, 255 may not be enough.