I hate growing up. I like being an adult, sure. I love the freedom, my wife, my son. But I hate all the responsibility that goes with it. I especially hate the bills. There's always a bill.
Granted if I was in better financial straights I'd have very little complaint, but I am, so I do.
Perhaps that's why I build with LEGO - I'm trying to put off fully growing up as long as possible. May my inner child never grow old... or up.