I for one want to see this
Chest and biceps/triceps are my favourite muscle groups to hit, but you can't have a good body without no damn well muscled legs. They're not my favorite, but I don't exactly hate working them either.
Squatting heavy weights takes the most out of me, but it's probably the single best lower body - or overall any part - exercise you can do.
For me, calves are the biggest body part pain in the a$$ to develop. I find I have to use extremely heavy weights on this body part, and a lot of sets (5 to as much as 10 on some days) and a lot of reps (in the 15 to 20 range). Such a pain. You can get away with underdeveloped quads and hams, but if you have weak calves no matter what the rest of your body looks like, you will look like a weakling teenage girl.