You cry when a child crawls up in your lap that you never ever had before!
Sitting at a small booth in a restaraunt, I was astonished when my husband said "Hey, did you see what you just did?" Thinking I had spilled something or messed something up, stand looking awed when he says "you got in and out of the booth without being "stuck".
Wearing the seat belt while driving which is a legal requirement in my state, where before when being pulled over for not wearing a seatbelt had to pay a fine!
These are just AWESOME feelings.