One bursts into flames in the sunlight, and the other is a vampire.
Spit Swallow Gargle
The porcupine has the pricks on the outside.
One bursts into tears. The other bursts out of tears
I've been flamed!
He was on his coffin break.
A teabag.
You try your best to keep your shoes from getting wet when you go to town.
There's no sunlight in the closet.
Refraction of sunlight in raindrops