Discipline: Not period, comma

Me: Isaac, get your foot off the table. You can make us sick.
Isaac: Ignores
Me:push Isaac's foot off the table
2.5 seconds later
Issac:puts foot on table
Me: Isaac, get your foot off the table. It has germs on it and can make us sick.
Isaac: Ignores
Me:push Isaac's foot off the table
2.5 seconds later
Isaac:puts foot on the table
Me: Isaac, get your foot off the table or you're going to your room...period.
Isaac: No, not period. Comma.