I like Chick-Fil-A - I really do :-) And nutritionally their greasy food is not even that horrible... except for one big exception:

milkshakes....

Milkshakes by CFA are a true calorie/sat. fat bomb. I was actually surprised that a chicken sandwich + fries is (if I remember correctly) equivalent to one milkshake... almost.

But I tried once, and they ARE yummy

Edit: after the website:
std chicken sandwich has 410 kcal, total fat = 16 g
fries (medium): 370 kcal, total fat = 21 g

milkshake (cookies & cream): 790 kcal, 33g (and 100 g of carbs :P)