If my little brother was doing something naughty before he could read we would tell him "that sign says you can't do that". Eg "that sign says you have to sit nicely on your chair", "that sign says you have to eat your veg" etc. it worked great in restaurants and shops and stuff.
We were also known when he was starting to not believe us a bit to recruit random waitresses to give him instructions so we would tell him the lady will tell him off and then have a quiet word with her and she would tell him to sit nicely or something :P
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