Usually, this makes them feel personally obliged to follow through on whatever narrative you create.

For example, let's say you're at a table and eating cookies, and the other person said they were on a diet. If there's one cookie left, even if you know they want it and are eyeing it, you can look at them and say, "you're on a diet and I'm holding you to that, no matter what." or something along those lines in a teasing way after grabbing it and eating it shamelessly. You can come off as caring to help them better themselves, despite being the asshole in the situation. Basically, you used their own words against them and trapped them to make THEM out to be shameless for even considering you being shameless. Use this sparingly though because repeating it too much can make someone who's aware more cautious with their words around you (though this happens rarely).

Another example is if someone says that they don't appreciate you talking to other girls/guys, you can hide your activities and then use that against them later by using that their words leverage to control them to do the same for you, if you're into that whole ego shtick. Not for me, and a bit too manipulative and controlling for my tastes, but it gets the idea across.

Frankly, the examples above aren't the best and were made on-the-fly, but the more someone reveals about themselves, the more perspectives of "I believe/do..." or "I like/dislike..." or "I am/want to be..." that you'll find. You can then attach those self-beliefs, or likes/dislikes, or desires or self-views into the narrative you want (ex. if they want to become a better artist, say "artists who actually care about becoming great need to experience life and get their hands dirty"...when convincing someone to go out partying with you when you need their car, and even then, YOU come off as considerate for "trying to help them"...then you tell them that you're busing and that it's starting really soon and then create room for them to give their car as an option because now you did something for them in their head, so now the pressure is on them to reciprocate that indirectly).

What's so deadly about this is that THEY made those claims, and you're also making vague statements which are true and encouraging but hard to pinpoint logically to be like "this is bullshit!" or to counter without sounding like an asshole who's trying to be contrarian or avoid getting out of their comfort zone like "many artists never engaged in hedonism, and yet they made timeless works", and so now, you are more likely to get what you want, while the other person (without realizing it) is deferring to you and perhaps even buying into the frame that you're an "empath" or mentor or a caring figure in their life.

This is a manipulation that I've been trying to word, and has affected my life the most because it's so damn subtle and hard to call out. Writing it down literally gives me goosebumps because it's among the most harmful that I've found. It's usually done unconsciously by certain personality types with high EQ who will do anything to maintain their internal peace, or by high-functioning sociopaths and the only way I've found to counter this sort of manipulation is staying away from these sort of possible and just distancing yourself, or at the bare minimum, not responding or reacting and setting hard boundaries regularly. I'd appreciate any other counters to this technique.

Edit: After doing something, I think a great way to fight against this sort of manipulation is knowing your path and direction in life, having set routines, and knowing what you absolutely are or aren't willing to compromise on within those routines. Additionally, being willing to say "no" or put ego aside and shamelessly say "I changed my mind, sue me".

Also, this goes deep. A lot of "mentor" or "alpha" types as some communities call them use this technique all the time. I'd like to assume that it's with good intent, but it whittles away at your ability to say "no" to them, and eventually, you literally become a puppet to their machinations.