The system works!

Earlier today, Alex comes in from outside while I'm at the sink washing up and says to me "I going by myself".
"Where?"
"On the naughty step."
"Oh, have you done something naughty?"
"I pull the leaves offa flowers."
"You're right, that was naughty. OK, off you go." And darned if he didn't. I went over a few minutes later to accept his apology and hug. Bless him - what a sweetie. Of course, not pulling the leaves off in the first place would be even nicer, but not nearly so cute.