Strangely satisfying things.

Every night when I get in bed, my mind just opens up and thinks about everything but sleep! Tonight my mind rested on a particularly peculiar subject. Oddly satisfying, even orgasmic, and addictive, non sexual actions. What are they for you? For example, my guilty pleasures that just make me so happy are cleaning my ears until the freshest cotton swab is still pure white, and popping pimples, both mine and my SOs. Yes, these things are generally not considered sexy by any means, and I don't get turned on by them, but they are so satisfying that when I'm done it's like I've just had multiple orgasms, I'm so relaxed and happy. So, what's your oddly gratifying action?