Verticality

I've been fighting a migraine all day today - it feels kind of like if you were the guy from Hellraiser with the nails stuck in your head, and you were forced to balance an anvil on your forehead while standing in the middle of a thick fog, and there's this little dog jumping up and down on the anvil and yapping, so you can't concentrate on anything....

If you've never had one, be happy.