2. Someone always cries and you get to experience what it's like to be a parental referee.
3. They plot against you when it's time to go home.
4. No matter what treats you've packed, someone always doesn't like anything and survives on air and seawater. Or, they inhale everything you packed and you must hide your own lunch lest it be consumed as well.
5. You've realize that while you remembered to slather everyone else with sun block, you did a really terrible job of your own skin.
Ever burn the top of your foot?