Just do to him what my grandmother did to me.
With the most woeful, solemn look on her face, she'd lowly murmur: But God was looking...
That worked really, really well on me until I was about 10 1/2.
Today, I always think that my grandma is watching...and that keeps me in check. She was a dear, dear woman and if there's anyone I would never want to let down, it'd be her.
But, yeah, I can still see that look and hear the gravity of her voice when she'd say that.
Oh my! She must have had the same play book my grandma had - but her line was "You'll make the Blessed Mother cry". She had a picture on teh wall, and I'd turn to look to see. Dang I'd forgotten that memory! (shudder)