If you got vocal piggies, they will actually "talk" to you like they talk to their piggy friends - means that they accept you as a fellow piggy.
Mine close their eyes when I'm stroking them and just sit there stunned and don't want to move.
Favourite game we play is "hide and seek" - I hide the treats and they have to look for them.....should see their faces when they spotted some! And each time, one of them has spotted something everyone else comes over to have a look and a nibble.
Some of my piggies actually climb higher to be near my face when I'm cuddling them....Snowflake likes to sit on the shoulder and watches t.v. from there. (Sometimes I get "nasty" surprises down my back ....LOL)