What is something you're good and bad at - at the same time? As the OP, I'll start, naturally.
Telling stories
Good: I'm pretty confident in my writing. My spelling and grammar can be a little off at times, but for the most part I've got good ideas, can write for intriguing characters, describe things in a detailed yet concise manner. I tell a good story via writing, and I've been told that too.
Bad: I can't, for the life of me, vocally tell a story about something that happened the other day, or anything of the like. My thoughts always get jumbled, and I feel I focus on the wrong things. Or sometimes I have so much to say that the sentiment or the whole of the words get mixed up in confusion, and words usually trip over eachother.
Telling stories
Good: I'm pretty confident in my writing. My spelling and grammar can be a little off at times, but for the most part I've got good ideas, can write for intriguing characters, describe things in a detailed yet concise manner. I tell a good story via writing, and I've been told that too.
Bad: I can't, for the life of me, vocally tell a story about something that happened the other day, or anything of the like. My thoughts always get jumbled, and I feel I focus on the wrong things. Or sometimes I have so much to say that the sentiment or the whole of the words get mixed up in confusion, and words usually trip over eachother.
I can't actually think of anything that I'm truly bad at. That sounds like the height or arrogance but I'm usually quite adaptable...
I can make very simple things food wise, but if I try to COOK something it ends up looking and tasting like shit 
I have no idea why. After I'm done with the test I think I'll have done really well, and then I get it back and it's usually a C. Sometimes a B when I'm lucky. While no that's not really bad, I don't like to get recurring Cs on tests. It's usually a few wrong where I did one stupid mistake, even though I checked it over 
!