On our way to Costco the other day, out of nowhere, this is what we hear from the backseat:

Little H:  We are not supposed to eat poison, huh, Mom and Dad?
Me:  No we are not.
Little H:  Good thing we don't have any poison in our house, huh?
Dan (wisely picking up on a teaching moment):  Well, we have some things in our house that are poison.  We have to be careful not to eat them.
Little H:  Like what?
Me:  Like the things that we clean the kitchen and the bathrooms.  If you eat them they can make you really, really sick.
Little H:  Soap is poison?
Me:  Some soap is poison.
Dan:  Eating any soap can make you sick.
Little H:  Then why do you guys always tell me that I have to eat soap after I get out of time-out?

Well, she got us there.  Tricky little girl, fooling us with her logic. 

And for the record, we have yet to follow through and actually make her eat soap.  Not that I'm against it.  Heaven knows it didn't kill me.