I just figured out a fun one for Pathfinder, so long as you're using the Path of War material from Dreamscarred Press (it's essentially an update of Tome of Battle, tweaking it to match PF, and adding new classes. Tome of Battle was a 3.5e D&D sourcebook that added Maneuvers aka Spells for Martials, to give some variety to being a Fighting Man and get away from just repeating your mantra of "I attack" each round).

For this one to work, we need a Barbarian. You all know the archetype - a guy who gets really mad and punches stuff, Conan the Barbarian, the Incredible Hulk. In D&D mechanics, they can enter a Rage which gives them bonuses to Strength and Constitution, making them more hit more and harder, and making them tougher to kill while enraged.
Pathfinder Barbarians also get access to Rage Powers, which they get at every even level. These are usually either 1/rage abilities they can use, or a small passive buff of some kind. The specific rage power that we're interested in for this Murphy is the infamous Body Bludgeon rage power - the flavour for this is fantastic, as you pick up an enemy and swing them round, hitting other enemies with them, and both enemies take damage from it. Sadly the mechanics, in true pathfinder tradition, do their best to stop you from actually using it. In order to pick somebody up and use them as a weapon you need to have Pinned them, which requires Grappling them and then Pinning them, two actions with a chance of failure at each step. Enemies can also break out of the grapple before you pin them if you don't have the Greater Grapple feat to do both in one round, or while you are swinging them around like a baseball bat. Secondly, you have to be a size larger than your enemy in order to pick them up and swing them around.

So to get around these petty restrictions, we're going to be using some 3rd Party Material, as noted above. I'm counting this as a murphy because DSP's stuff is usually mechanically sound, and often better than the base pathfinder stuff.
We're going to build our Barbarian using the Primal Disciple archetype from Path of War, which trades out a few features (notably every Rage Power aside from the first one you get at level 2) in exchange for access to Maneuvers and Stances. This means we need to take a feat at level 11 to get Body Bludgeon, but that's easy enough, and we need to be level 11 for this to work anyway.
Unfortunately Primal Disciple doesn't give us the Discipline we need for this, so we'll have to swap out one of the four we get for Solar Wind by taking a trait.
At level 11 we can take up to level 5 maneuvers, so we're going to go ahead and take Focused Solar Lance - this only works with ranged attacks, but thrown weapons count for that so we can pick up a few spears to use. We probably also want a Belt of Hurling so we're using our mighty Strength to throw them, rather than having to focus on Dexterity as well.

Should we hit with our spear, we do some bonus damage and more importantly, we make a CMB check to prone and pin the enemy. This CMB check uses our Initiation modifier, which is Wisdom, so it's not quite as high as it would normally be but we get a +2 bonus for the maneuver itself. Body Bludgeon doesn't state that you have to be next to the enemy, just that when you pin an enemy you can use them as an Improvised weapon, so I'm assuming that we have some rope tied to our spear and we're using our furious strength to pull them over here and swing them around like a fleshy flail.

The other parts of this are just size stacking - the Half-Giant race from DSP has Powerful Build, which lets us count as one size larger if advantageous, letting us swing around enemies the same size as us. We can pick up a Stance from the Primal Fury Discipline for another +1 effective size, allowing us to pick up and wield enemies a size bigger than us! It even increases the damage of our impromptu weapon by two steps, which RAW would stack with the first part of the Stance as it's boosting a different thing. And of course somebody could just Enlarge us with magic, which stacks with the other two methods mentioned.
We probably also want to pick up the Catch Off Guard feat, to avoid taking a -4 penalty to attack with our impromptu bat, and why not Improved Weapon Master as well, to increase the damage dice by one step and give it a 19-20/x2 crit range aka make it functionally equivalent to just using a regular weapon like a greatsword for the low low price of two feats.

Worth mentioning that this technically works with any ranged weapon, thrown is just so you can use Strength for your to-hit roll. You could hit someone with a slingshot so hard and so angrily that they bounce off the floor and into your hands, ready to baseball some fools. Heck, you could take Throw Anything so that once you've recovered the Maneuver you can refresh your impromptu bat by throwing it at another shmuck and bouncing them into your hand. The possibilities are endless!

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