Me : I will be so careful in the sun on vacation. I wish I could always remember to put on sunscreen in the morning.

Monkey's Paw: Ahahaha. <finger curls> 

Me: Oh no.

Monkey's Paw: It will last for months after the last time you use a sunscreen with a sensitizer!

Me: I'll try some steroids?

Monkey's Paw: They're photosensitizers.

Me: I'll stop going out in the sun.

Monkey's Paw: The walk to the car gives you face blisters that last for a week. Have fun! 

(It has been nine weeks. I curse my Ashkenazi ancestors for this.)