I missed Mommy?

Today was Kueffer's first day to attend Mother's Day Out. Mommy was stressed the entire night before and morning hoping that he would not get upset when she left. Well...Kueffer fell asleep on the way there, so he did not get upset when she left. He did not even know it. During the day, one of mommy's friends e-mailed her an update that Kueffer was having fun when she dropped off her little boy. Relief. Mommy imagined that Kueffer would be so happy to see her when she picked him up in the afternoon. He was away from her for 5+ hours and should miss her, right?! Mommy went to pick him up and a little boy cried for her when she arrived at the door. No, it was not Kueffer. It was another baby thinking this was his mommy. Kueffer did not even notice. Mommy called his name...nothing. He was too busy playing. Yes, Kueffer had a good day at Mother's Day Out and 'no' he obviously did not suffer from 'separation anxiety'. :) Should a 6 month old be this independent!?!