2. Eyewear
"Crowley," said Aziraphale one day, "Why do you insist on wearing sunglasses?"
The demon threw him a sceptical glance. "Well, in case you hadn't noticed over the pat six millennia, my eyes are hardly what most humans call normal."
"Nonsense, you know what I mean," said Aziraphale impatiently, "You could easily get away with those coloured eye things."
"Contacts? Nah, tried them once. Just made my eyes feel sore."
***
The contacts did honestly hurt his eyes, especially when they were accompanied by a pair of fingers poking them repeatedly. Humans, he'd muttered rubbing his eyes, they could put hell out of a job anyday.