Maddening Hex and Iroh, Tea Master
After giving control of a Maddening Hex to the opponent via Iroh, Tea Master, the target of the aura spontaneously swapped from the opponent to me during the end step of their first turn after the aura changed control.
The aura continued to correctly target the opponent for the majority of their first turn after being gifted, but during the end step of this turn when I cast a noncreature spell, the aura swapped its target to me and hit me for damage.
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Rezzahan#77802
commented
You gave away control of Meddening Hex. At that point it is enchanting its controller. Then its controller, your opponent, cast a noncreature spell, triggering it to deal damage to them and attach to a random opponent of them. Which is you as the only possible choice. So they control it and you are enchanted now. Then you cast a noncreature spell, triggering the damage and the trigger tries to reattach it to another opponent of you opponent. Which cannot hapen since you are the only available opponent. So it stays attached to you. And this will continue until the aura is removed or reattached to another player, but it cannot achieve that itself in a 2-player game.