I haven't listened to Animal Collective in a very long time, mostly because, while the show was good, they didn't seem that happy. This is totally my own perception, but I was happy they came out to play an encore.
Also, do you ever stop listening to music because it reminds you of something sad? That's another reason I stopped listening to AC. I was going through a rough relationship at the time and the songs just reminded me whom I was with.
Those days are long gone. A big HOORAY! I am so much more confident with myself and realize I should return once again to Animal Collective and send my friend A a few of my personal favorites, so he can have a listen before he attends the show.