Explanation:

In the Twisted Metal games, Calypso is a demonic evil genie who grants you a wish if you win his tournament but always corrupts it so that it backfires on you and you die.

In Skullgirls, the Skullheart is a demonic evil genie who grants you a wish if you defeat him in battle but always corrupts it so that it backfires on you and you get turned evil.

Moral of the story, if someone offers you a wish, just say no.