It USED to be anything requiring the use of my lob wedge. Now, though, that might be my best game.
Now, my least-favorite shots have to be the up- or down-hill par 3's. Even with the distance markers, something about knowing I've got one shot to get to the green plus having to account for elevation differences just screws me up. I'm not very clear on my iron distances yet anyway, so it's just bad.