Arrgggh

So, does anybody else's cat do this? Fitz loves to lay in my lap, bite a chunk of my shirt and knead me while purring like crazy. Several times a day, which leaves various damp spots as well as an extra layer of hair. I know he must be reliving his kittenhood or something, but he really gets off on this . . . I'm still up in the air as to whether it's annoying or sweet.