Can Mjolnir be lifted & wielded by anyone if Thor is touching it?

In The Big Bang Theory episode The Bakersfield Expedition, Penny, Amy, and Bernadette are having an argument if Thor's hammer:

1. Can be lifted by anyone in space.
2. Can be lifted & wielded by anyone if Thor is touching it.

The first argument is settled in Can Thor's hammer be wielded by anyone in outer space?.

But the second argument remains unsolved. Can Thor's hammer be lifted & wielded by anyone if Thor is touching it?

• Keep in mind it's not the weight/mass of Mjolnir that prevents people from wielding it, it's the enchantments. So I suppose, a follow up would be--what happens in zero-g? Does Mjolnir remain in a fixed position in space when Thor isn't touching it? Or, when in zero-g, does it float around like anything else and just limits the hammer's "special abilities" if someone tries to wield it? Commented Feb 15, 2013 at 19:31
• That question is partially answered in the link given above. Commented Feb 16, 2013 at 10:11

Yes, in Marvel comics and cartoons Thor's hammer can be lifted and wielded by others if Thor is touching it. The trick is that they have to be strong enough to overpower Thor. The Hulk has done this in a recent issue of Avengers Assemble (#4):

The same thing happened earlier in the Hulk: Let the Battle Begin one-shot.

Finally, there are many, many instances of the Hulk either lifting or tossing Thor while Thor was wielding Mjolnir. Here are just a few of those.

• To be fair, that's the Hulk, who can actually lift Mjolnir by himself when he's angry enough. Commented Aug 12, 2014 at 15:12
• No he cannot. It's one of Hulk's REPEATED frustrations that this bit of metal will not be budged by his musclepower. Commented May 9, 2020 at 4:09

The second point is up to interpretation, based on how you define "lift up".

This also depends on which interpretation of Thor you are considering: The original folklore has Thor's hammer stolen at least once, something I'd consider impossible, if only the worthy can lift it.

As for Marvel's Thor I'd say anyone (strong enough) could lift both at once. Otherwise no bad guy would be able to throw or kick Thor around as long as he's in possession of his hammer. I've only seen the old animated series years ago, but I think I remember him being kicked around at least once.