Is Mjolnir actually capable of flying back into Thor's hand like a boomerang after being thrown? This is something Marvel's Thor does all the time: !enter image description here So I was wondering: **Has Thor/Mjolnir ever done anything like this in actual Norse mythology?**

Yes, it seems so. In the Prose Edda, when Thor is presented with the hammer by Brokkr, this property is in the description (Page 147, here):

> Then he gave the hammer to Thor, and said that Thor might smite as hard as he desired, whatsoever might be before him, and the hammer would not fail; and if he threw it at anything, it would never miss, and never fly so far as not to return to his hand;