lately, we've had to discuss with emma what it means to do something "on accident". usually we hear, "Mom, i accidentally opened the front door" (or insert some other action which she knows is wrong). To which we reply, "no, emma. actually you really did mean to open the front door. you did it on purpose." "Oh, sorry, mom."
well today, she came in to the kitchen while I was getting Jackson's breakfast ready saying, "Mom, I meant to spill my milk."
It took me a while to process, but reassured her that no, she probably spilled her milk on accident.