A bowl of ice cream
Delicious topping for the ice cream
Ketchup, mustard, and mayonnaise
Begin by showing your participants a bowl of ice cream. Ask what kinds of topping they like on their ice cream. (Chocolate, caramel, whipped cream, etc.) Now place the delicious topping on the ice cream and ask who would like to eat some. (Most should.) Pull out your bottle of ketchup and explain that you especially love ketchup on your ice cream, as you add not only ketchup but mustard and mayonnaise to the bowl. Again ask which participants would like to eat the ice cream. (None should want to now, but if one should volunteer, let him/her eat some.)
Explain that there is nothing wrong with ketchup, mustard or mayonnaise. They are good, just not on an ice cream sundae. Ask what type of activities are not good on a Sunday? Compare the ice cream example to activities that are not good to participate in on Sundays. Hold up the bowl of ice cream and ask them if this is what they are giving to the Lord on his day. Encourage them to engage in activities that keep the Lord's day holy.