Parents never fully understand what they're signing up for with parenthood. They expect the big stuff like birthdays, teaching ABCs, and graduations. But it's the small, unexpected moments that make up most of being a parent. These moments can make them laugh uncontrollably or leave them in shock at who their child is turning into. Every kid is different, and parents often wonder, 'Did I sign up for this?' The Parent Trap She only wanted a quick bathroom break, but her four-year-old saw it…