I lay my hand flat and hold still while they eat from my hand. Yeah, you would not want to make any sudden movements so you don't spook them. Its kinda cool
Try playing tug of war with a worm, its pretty amusing LOL. Make sure you let go before they REALLY start tugging or you'll end up with alot of worm juice in your water.
My motoros used to climb up the front of the tank and take food out of my hand. I've got one hystrix now that does it, and another one is starting to learn where the food comes from.