When I picked Tyler up from daycare today, Kathy told me "Tyler is the most polite non-compliant child I've ever had!"   Apparently when she asked him to clean up his toys, he told her "No tank you!".  

He does that with me, too when I try to get him to do something he doesn't want to do.  "No tank you! No tank you!"  Yeah, he's saying no, but it's so freakin' cute it almost hard to scold him...