I have all of my chins trained to come to a specific spot in the cages when its treat time. It's funny because when I walk in the room, no matter what the reason or time, at least four of them go straight to the "treat shelf" in their cages.
I also have a couple that like for me to hold out my arms and they run out to my shoulders and then turn around and run back down my arm to the cage again. Some like to sit on my shoulders and nibble my hair.
I also have one chin who is fond of grabbing my glasses and taking off with them (NOT my favorite game!) And one who likes to groom my face, eyelashes, and eyebrows, mostly.